A good kick start to making money is picking the allagan gold option from quests, it's nice at the start but once you finish quests you won't have that option anymore.
Hopefully, it will help you out a bit as you level.
As always, use your best judgment when picking rewards.

Another option is consumables. Pay attention to what sells and how often it sells via AH and go for that, just don't overcrowd the market.
Like others have said, dungeons will drop a nice amount of gil so that also helps.