It's pretty hard to make money crafting, but doable, and I think you just need to understand that going in. So I think what's most important is that you enjoy doing that particular craft. The selling is just icing.
Leather working, Jewelry, Tye dye, Hand made rugs...what do YOU like? Experiment, and find out.
It really just comes down to what you enjoy most and that you aren't expecting to make a full time job out it.
Commissions are always good!
Sorry if that was unhelpful