Don't be concerned about your crafting or gathering classes until you finish your Main Scenario quests. (2.0)

A lot of stuff is gated behind them, so getting through those quests should be your main priority as a new player. There is a lot of quest EXP associated with them too, so your first combat class should be extremely easy to get to level 50. You will have to dungeon grind maybe four or five times around level 40-ish if you ignore all sidequests along the way. (And probably not at all if you do choose to do the various side quests.)

Also, crafting/Gathering is best leveled through levequests, which you can only automatically obtain over time. New players won't have a lot of leve allowances saved up.