I agree, Infinity was on the departure list for a reason, and it is not more populated after the emigration. I am playing at Europe-Chimaera and we definitely see a bunch of players all days of the week with less activity in the late night/early mornings, but it is never ever empty even in those sleepy hours.
If you have never played the trader before, stay away from speed grinding an learn as you go, keep an eye at that guide with the too many formulas, you'll need it later on. However, with some exceptions all trader professions but Architect (one of the legs in Structure) will not have much to sell until Master. Plus Architect can sell from day one, and a few houses a week is not a bad income starting from scratch. Plus you will level up the fastest even if you don not craft in practice mode one single item. Stash away Walls wherever you can put them, they can be used later on, as do Generators once you learn them. Minus Architect is more resource hungry than the others, so start pulling up Ore as soon as you can and get yourself recyclers for at least Ore and Metal. Later you can respec to any other Master trader, even though you have to read up on that profession at that point.
Quests, not at all, on the contrary, SOE has deliberately (???) not given us any quests at all. Nothing like the Legacy, nothing, void, vacuum, empty as inside a stormtroopers skull
Space is cool, but SW is both resource hungry and calling for high-quality resources which you do not have as a rookie, plus you must be a Master to do the best stuff. Not all of it requires that, but ... However, do the Pilot lines and you will have fun, looting space stuff of which you can sell the crap to the NPC in star ports for a good bunch of credits, RE some for practice and those lucky (name???) things you want, and keep the goodies for later use in whatever fashion.
Engineer is becoming the flavor-of-the-month in next chapter (or GU?), but right now it is not that good. Munition, once you are Master and have stocked up on resources (read that as after about 4 to 6 months) you can make really good credits. weapons have always been in demand, and will always be. Since they are bio-linked these days there is no real 2nd-hand market--no need for decay these days
AS is equally good, but also that has quite a steep starting curve.
DE can be really interesting when that upgrade comes, thus, while learning the trade as an Architect only to switch later on, keep an eye at everything posted about it and stock up on what you find will be used then. Possibly the Devs do not change too much schematics resource-wise, so use SWGCraft (and maybe SWGAide) to see when the best stuff is around and hoard it for future use. Stay prepared and your business will get a kick-start with that upgrade.
Finally, welcome around, hopefully we can swing a Jawa Beer in Mining Outpost, Dantooine, one day