Damn, lost my post...
Yeah, zbyl's right. If you are a sub, you want to pre-purchase them, saving you a lot of pain. It also allows you to buy perks like the mailbox on your ship, or with 5(!) million and legacy 25 the GTN. Which is the best upgrade.
Sadly zbyl and me subbed a bit too early looking back at it, in the stage with few purples and a lot less money going around, and low legacy lvl.
I did take the oppurtunity to get the ship vendor and a fully unlocked inventory.
There are plenty of good (account) unlocks on the GTN, you just have to check in from while to while to see what prices are offered. Some days they're outrageous expensive, the other very very cheap. Depends on the people putting them on and the competition.
Daily income depends on area, Ilum gives the most cash (besides H4 in other places), SectionX the most dailies. Black Hole doesn't give as much but is quick to do. And Belsavis is rather easy. Most people avoid it though. It's nice to relax and not worry about other players though.
Weeklies there are many of. Need more info what you seek. PvP? Operations? Hard Mode Flashpoints? Black Hole/Section X? Space? Too many of them to answer that easily.
You generally get good weapons for your teammates doing regular questing. I don't really bother looking for good gear for them leveling. Nor myself rather. While people who do makes me plenty of money on the GTN I just do with the drops I get .
Augmentations will be good yeah. I only got one dropped EVER, and they're expensive on the GTN. So you can count me as customer when lvl 50 . I'm having artifice btw. I'm not that big a fan of crafting though, so usually stick to gathering skills. And I don't think I really crafted something worthwhile with arfice yet besides +41 power crystals for zbyl and myself.