Al anyone can really say is sell stuff in the AH. That's the key to get the big money. Take the drop items you get and check the prices they go for at the AH and sell'em for one gil less. So if it says it'll sell for 200, put it up at 199. That way, you have a better chance of them buying yours instead of someone's whose is listed at 200. Get in groups because for some reason, you get drops more in them. Also, sell crystals in groups of 12 if you don't need them. I don't know about San d'Oria, but in Windurst it's hardest to get fire crystals and they sell for anywhere from 1200-1500 in the AH. Do little quests for people too, a lot of them can be repeated and are a source of easy cash.