Don't worry too much about the gold, especially in the beginning. Both dungeons are chock-full of it - you can pretty much buy everything in the game just by looting the chests in the second dungeon. Until then, keep yourself in herbs and inn visits with the money you get from fighting slimes. Just concentrate on leveling up and learning all your kana, so you can get into the dungeons.
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(BTW: I forgot what they are called, but there is variety of slime that gives uber amounts of EXP...take the Gil loss out on theie hides, I says!)