Well, you level Archer to 30 and Conjurer to 15, then you're eligible to take the quest for Bard from an NPC in the Archer guild in Gridania. You'll need some higher level help with this because I hear it's just not possible for even a full party of 30s to beat the first job quests. Most people had at least one level 50 when doing this so it was kind of a breeze for them.

As far as money goes, you might be better off just selling the stuff you mine up in the short term to make some money to get the gear you need. Later on it might behoove you to level up your craft some more. It just all depends on what kind of pace you want to level your archer versus your crafter. Leveling up a battle class takes significantly less time in my opinion.