
If you're looking to keep up on PVE stuff, you'll be able to buy things pretty steadily as you go in each new aetheryte camp you're sent to. Your job quests also give you a pretty decent selection of gear, not to mention the sidequests.
As mentioned by the friendly qiqirn though, you can't glamour until level 50! So you're forced to make RP sets beforehand. Economics-wise, you could consider taking the allagan currency rewards as you go through the main story: It adds up to something like 200k when all is said and done? Once they start offering you silver, it's not a bad idea to start stockpiling. Don't forget to unlock your Challenge Log in Limsa at level 15, too! It's a series of meta-challenges that resets every week and is very effective for lining your pockets, just as a by-product of playing the game.
As mentioned by the friendly qiqirn though, you can't glamour until level 50! So you're forced to make RP sets beforehand. Economics-wise, you could consider taking the allagan currency rewards as you go through the main story: It adds up to something like 200k when all is said and done? Once they start offering you silver, it's not a bad idea to start stockpiling. Don't forget to unlock your Challenge Log in Limsa at level 15, too! It's a series of meta-challenges that resets every week and is very effective for lining your pockets, just as a by-product of playing the game.