Also be sure to get grimoire's when they become available. Most of them become available after talking to a merchant a certain amount of times and reading the hunt board(20 & 40 times). Here I'll just tell you them:
hunters monograph - after thextera hunt, talk to Gatsly in Muthru Bazaar
knights monograpg - talk to any wpn merchant more than 30 times
warmages monograph - read hunt board more than 20 times
mages monograph - talk to any magick merchant over 25 times
scholars monograph - talk to any merchant more than 15 times
dragoons monograph - read hunt board over 40 times
sages monograph - talk to any merchant over 100 times
canopic jar - sell phobos glaze, horakhty's flame, deimos clay
Easiest way to get gil if youre in bad need of it IMO
1)chain on mobs with good loots
2)steal with thiefs cuffs
3)sell old armor/wpns (should be a no-brainer)
4)dont waste money on unnecessary gambits, techs, magicks (till youre rich)
Good Luck! Youll be rich before you know it.