I quick way to get a decent boost in your gil at those early levels is to farm things that drop fire and wind crystals, silk, wild onions or bat wings / fangs. You basically level up while you gather in those items, so it won't even seem like you're farming.
I'd suggest starting in windurst to do this, I'm not sure about the other areas. In any case, the items all add up, so early on you won't have to worry too much about gil.
Just a suggestion though.![]()