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• The bad news first: Since I am operating under the assumption that you have literally nothing on most or all other servers, subscribing for an initial month is highly advisable - simply because you need to be able to hold more than 1,000,000 credits in your hands. (If you already did this, ignore this part.)
• the rewards on the subscriber track are what you want: all of those sweet 2000 CC are there, and most of the season tokens. This means that even if you don't start as a subscriber, you certainly have to finish the season as one (the good news is that subscribing retroactively unlocks all rewards on the subscription tracks, including those you earned while you were not subscribed). If you don't want to fork over the subscription fee at all, you might just as well stop reading here.

• Generally, this guide assumes that RP or playing through the story is no priority of yours; and neither is an optimized legacy (my guide for that is here ) - this is just about getting through the Galactic Season with as many legacies as possible in relatively little playtime.
• Unsurprisingly, stealth classes are most convenient for this endeavor - whether you are doing FPs, do the usual 8 quests/100 mobs-thing or whatever else that isn't a space or GSF mission, you're best off with a stealther - ideally a Shadow/Assassin (since they get crowd control a lot sooner than the tech stealthers), but a Scoundrel/Operative will do as well.
• create one character per faction - as a rule, you don't need more than these two (and in fact you should concentrate your efforts on these two because anything else tends to be a waste of time). Occasionally you will have to create new alts if a weekly objective asks for it, but these are little more than deco for your legacy otherwise.
• In addition to this: If you are one of those people (like me) who never bothered to blow their character boosts, now is their time to shine: A legacy that consists exclusively of fresh characters is somewhat limited in its options and might have to resort to skipping weekly objectives because the respective planets or FPs are out of reach; a level 70 character however can do pretty much everything as long as it isn't faction-exclusive (also, they get a heap of conquest points simply for reputation increases, which is the easiest way to get the daily 25k). I would strongly suggest to prioritize Leviathan and (if you have a second boost left) Tulak Hord for these - not just because of the language barrier, but also because these two servers are less populated than the English-speaking realms. It's particularly jarring on Leviathan where even during peak time you might have a hard time finding a group for world bosses or FPs, so having a high level character here is immensely helpful.

• as soon as you enter the game, activate "exploration missions" on your map interface.
• get a companion from your collection (more on that under #6). At the very least you should have universal access to Amity, since you only need GS level 1 on your main legacy and unlock that compantion for your entire account. (unlocking Amity costs 60 CC).
• as soon as you get your first +25% XP boost, activate it.
• once you're level 8, get to the fleet:
• there you learn a few gathering skills (preferably bioanalysis and scavenging among them since you're most likely to use these)
• then you buy a speeder (this part is most important)
• and you may buy your faction's capital stronghold.
• return to your starter planet and do all the quests there (they're generally quick and easy), without any double XP event currently active, you should be around level 17 before you move on to your faction's capital world.
• once you finished the starter planet, pick up the stronghold quest from the hologram; if you haven't bought a stronghold yet, do it now. In this stronghold, you place a legacy cargo hold (reward from the hologram quest mentioned above), Felusia Stato (same), a mail box (same), and finally a personal cargo hold (available for 15k at the security key vendor). If you can't afford this right now, definitely do it ASAP.
• This should have taken a bit more than an hour or so. Rinse repeat for the other faction's character.
• Depending on this week's objective, you might want to complete the class story on the capital with at least one character: if, say, space missions are needed, you need to get your ship first.

• One of the things you should definitely do soon is finding a guild - if only for the XP bonus and the weekly conquest yield. Bigger guilds are of course better (maxed out XP bonuses, Flagship perks and large yield invasions are quite helpful), but small ones will do as well as long as they're invading something. This also means: if you get ninjainvited by a huge guild on a starter planet - even if you otherwise hate that, now is not the time to be picky.
• with "soon" I mean before your first weekly reset: you only start collecting conquest points on behalf of your guild after the reset, and you'll get your first conquest yield the week after that. I.e. only in week 3 you will start to capitalize financially. All the more reason to not drag that out.

• I wrote extensively about optimizing your legacy in my guide for fresh legacies, but this doesn't apply here: With only two active characters which you won't level more than necessary, you can also forget about leveling your legacy - i.e. no perks, no heroic moments, no bonuses. After getting to level GS level 100, most of my legacies were around level 7 at the end of season 2 and around level 12 at the end of season 3. Go figure.
• This also means that the only useful thing you can buy is the rocket boost, on a 2 minute timer (yayyy...) - if you have enough money (unlikely, at least in the beginning). Once you hit legacy level 2, you can buy Fast Travel I (minus 2 minutes on your fast travel CD), which is actually worth the 100k.

• apart from their usual role (supporting you), a very crucial element of companions is that they're a source of conquest points via the daily "Influencer"- and "Benefactor"-objectives, which you'll need unless you have a character over level 50 (for the Reputation-objective). While it's easy to do in the beginning, the higher your companion gets the more gifts you need to push him further. For that reason you might want a wider selection of companions.
• apart from Amity, you have your first companion plus your ship droid, and if you don't level your character's class story, that's pretty much it for you unless you have a bunch of companions in your collection. If you don't, one way of collecting those is buying them at the Galactic Season vendor - they change on a weekly basis and cost 5 (or was it 6?) tokens, and unlocking them for your entire account is pretty cheap. Which means that while you may not be able to afford them in the beginning, once the season has progressed far enough that you have 6/15 tokens on every server, you can basically buy half of them in one swoop, and can still save tokens on your main server for stuff like the penthouses.

• since currently there's no dual XP event, leveling is relatively tedious, even with aforementioned 25% XP token and the 15% guild bonus (and since you have neither the legacy level nor - at least in the beginning - the money for the legacy perk "class mission experience V", this isn't really an option either).
• I suggest to level as far as you need for the easily available objectives. For example, for the "Terrors of Taris"-objective I had to bring the imperial character on every server to the mid 30s. Other than that, I would leave them where they are unless you have some spare time.

• For bullet point #9 (strongholds), you need loads of cash - not very much for a seasoned player with a lot of charcters, but a lot for a legacy that's essentially virginal - getting enough money without a sponsor and exclusively by yourself is out of question, especially after the cuts for weekly conquest.
• I suggest to sell your encryptions, legendary embers and whatever else you can turn into credits as soon as possible. In my experience and right now (April 2023) encryptions sell for between 10,000,000 and 12,000,000 - depending on the servers of course. If you manage to sell those for a decent price, you should have enough cash to afford your 150% stronghold bonus after a few weeks.
• if you did enough GSF weeklies (and therefore collected a bunch of fleet commendations) you might also buy epic equipment for space missions relatively early on. Those are so expensive on most servers that even if you manage to sell one piece faaaaar below the averge price, you end up wealthy enough to afford six fully expanded strongholds (and since there isn't really anything you can do with anything you acquire on those other servers, that loss in cash doesn't really hurt you).
• another option would be a "galactic season pact", if you manage to find trustworthy people: you trade around 50 million credits with someone from another server (which is very little if you have an established account in today's economy), then both of you can buy six fully expanded strongholds right off the bat. If you can repeat this on all other servers, this would be 200 million - for multibillionaires not that big of a deal; but one that saves you a lot of conquest grinding time down the road.
• For more on finances during Galactic Season check this post.

• if anything, getting your 150% stronghold bonus is even more important than usual: depending on how you do it, up to ~50% of your 800 GS points may come from the daily quest (25k conquest, always available) or the occasional "Marching Through the Galaxy"-weekly (200k conquest, pops up occasionally). So you want to get these 150% as soon as possible.
• You get up to 25% for one fully expanded stronghold, so in order to get there, you need at least six strongholds (but more likely seven, since partially expanded strongholds might do the trick as well). Here is a table for the least expensive combinations.
• unlike all the others, the Umbara stronghold is only available on Odessen. If you know how to get there with a low level character, let me know.
• the strongholds are the reason why being subscribed is advisable: Without a subscription, you're capped at 65% since you can't spend more than 1 million credit at once (which limits you to 9/9 Coruscant, 9/9 Dromund Kaas and 5/9 Nar Shaddaa).

• a Galactic Season lasts 20 weeks- this means that you have to gain at least 40 points per week on average if you want to complete the reward track (800 points) just in time, more if you start later.
• as a subscriber, you gain: 8 points per smaller objective, 12 points per larger objective, 8 points as a 4 day-login bonus, and 2 points for the daily objective. So, if you do at least 2-3 small goals per week, and regularly log in for the "influencing the galaxy"-objective, you get between 38 and 46 points per week.
• as a non-subscriber, you gain: 6 points per smaller objective, 10 points per larger objective, 4 points as a 4 day-login bonus, and 2 points for the daily objective. So, if you do 3-4 small objectives per week, and regularly log in for the "influencing the galaxy"-objective, you get between 36 and 42 points per week - and between 46 and 54 points per week as soon as you resubscribe for the last month. Because even if you are trying to minimize your subscription fees and only subscribe for cashing out on a completed reward track, you still don't want to wait until you have hit level 100 with every legacy, but subscribe quite a few weeks before that (around the 600 points-mark, depending on how many GS points you can reliably make within 4 weeks and 2 days as a subscriber) and finish while you are still subscribed.
• since every week has 10 possible goals, you don't have to do the bare minimum - I would always try to do as many as you can comfortably do (well, up to 7 objectives, that is): it enables you to take a break, do fewer objectives than required, or finish earlier. Personally I pick those that take the least amount of time, but if you like specific mission times better even with fresh characters, you might also do those.

• "Influencing the Galaxy" is the daily objective that is always available; and it requires you to get 25k conquest points - and it's also the main reason why you want that 150% stronghold bonus. Because with that bonus, all you need is "Influencer" (just level a random companion with cheap level 1 gifts; buy a bunch of those in advance at the fleet), "Crew skill up" (just send a companion to do a yellow quest) and "Decorator" (just move one piece of furniture around 5 times); if you have less than 150%, you may want to do a few more objectives ("Benefactor", 5 crew skill missions and using a taxi are the best suited). But if you have a character of level 50 or higher, you can do the daily simply by raising your reputation with any faction. This quest yields around 18k-19k conquest points even without a stronghold, over 25k once you have around 45% stronghold bonus, and almost 44k if you have the 150%.
• "March across the Galaxy" only requires you to regularly do "Influencing the Galaxy" (which yields at least 175k per week) and get a few extra conquest points on top of that. Time invested: practically 0.
• the collecting 40 notes-objective can be achieved as a side effect of just doing your thing. Time invested: practically 0.
• the 1000 reputation with Amity-objective can be achieved by just trading in enough notes with her. Time invested: practically 0.
• "Ace of the Armada" just needs you to do the very first escort mission four times, and since that only takes 3.5 minutes, you can do that quest in around 15 minutes. More importantly, as long as your starship doesn't get shot down (and with some cheap ship armor and shields this is basically impossible), you can AFK this mission because all you need is survive - you don't even have to protect the ship you're supposed to escort. Read something or watch youtube or whatever and only get back to the game every 4 minutes until you're done with that objective. Downside: only available for characters with a starship (i.e. those that have finished the capital world class story).
• doing 15 quests as a specific class is fairly simple: just create a new toon and do every quest you find with them. Takes around 30 minutes. (Unless of course it's a class you already have.)
• simple tasks like "kill 25 mobs without a companion", "affect 15 mobs with usables" etc. are super easy, barely an inconvenience. Do them. (Bonus tipp: "This will do nicely" can be done in 1 minute by doing the Coruscant H2 "The Republic's Most Wanted": just enter the phase, get to the room on the left, trigger the usable, get out and reset the phase. After the third explosion, you have done it.)

• those grindy regional objectives (doing 8 quests/100 enemies on a planet) are fairly straightforward; especially with stealthers. Shouldn't take much longer than half an hour, possibly even less. Downside: You need a sufficiently leveled character for this - but since you get a selection of planets, this shouldn't be that much of a problem.
• world bosses are generally easily done for the points they give (the exceptions are Ossus and Voss), but finding a group might be a bit tedious. The bigger problem however is that you may not have a character that is high enough, which means that you either have to skip that objective or level your respective toon.
• "Legacies of..."-objectives require you to run instances - either once with bonus bosses, or twice without (since unlocking the bonus boss - if available - can be extremely tedious, I personally stick to doing them twice). By the way, if an FP has a storymode available, it counts as well; and these can be super quick if done with a stealther - "Boarding Party" or "Assault on Korriban" for example take around 10-15 minutes. Ultimatelly, I actually ended up doing all FP objectives since those were pretty convenient and easily done - there's always at least one FP that doesn't take too long or can even be solo'd.
• Daily Sweep quests depend on which area you're sweeping. Doing 2/2 CZ-198 dailies was pretty chill (even though I had to do it on two separate days, which I usually am not too fond of), but I skipped everything else.
• 6/6 starfighter matches may take around 1 hour - assuming you win as much as you lose, it takes 4 games to meet the goal; and if each game takes a bit longer than 10 minutes on average, that's where you end up. Even though I like GSF, after my experiences during GS 2 I ultimately came to the conclusion that the juice isn't really worth the squeeze here - 20 GSF matches on five servers (assuming that you win as much as you lose) in a week are simply too exhausting if you ask me. However, if you still want to do it - don't forget to do "Introduction to Starfighter" and then regularly the daily/weekly for upgrading your starfighters! (Also for Fleet Commendations.)
• something similar can be said for the 8/8 PvP matches.
• medal collecting-objectives (both for PvP and for GSF) aren't something I would recommend unless you are really good at it.

• Season 2: It took quite some time in the beginning, because a lot of objectives were effectively behind level restrictions (which means that I had to level my characters every once in a while), and I had to get enough money to get the 150% conquest bonus - but once I had gotten there, it was pretty easy and most obejctivess little more than a formality; and it became a breeze once I had one character over level 50 (i.e. was able to do the "Influence the Galaxy" with a single click as long as I had rep tokens).
• Season 3/4: This one was a bit easier since I already had at least on level 50 character on every legacy, but the objectives were harsher: While GS 2 had a pretty forgiving start with plenty of low level objectives, GS 3 required you to have characters in their 30s or 40s pretty on. Same goes for the beginning of GS 4: My legacies are pretty solid by now, but the first week already starting with objectives that include killing the Voss WB is pretty harsh.