In terms of making money, I'd have to vote botany, especially starting out. You can get mats for Carpenter and sell the rest. On Besaid, maple sap sells 1k a pop, and I've gotten a stack and a half logging in Gridania (grades 1 and 2) for 1-1.5 hours. Also get maple logs, which you can either craft or sell.

Looking long-term, I'd have to steer you towards armorer, leather(DoW)/weaver(DoM), and Blacksmith(DoW)/Carpenter(Lancer/some DoM) for materia purposes. ^-^ Leveling-wise, leves are prooobably the best way to go right now, just pick the ones that you turn in in the city or at the first camp.