short summary
I would say that probably the sage or jeweler is the one that makes the quickest buck (ok well plat really) in this game. It all depends on supply and demand of course. Sage is famous for making good money. Easiest and cheapest to level is the provisioner and they make a steady income that quickly adds up (you might learn to not like that stove and keg so much when you keep having to go back to make more stuff). I have a more detailed post in my gaming blog, please see link in this lens.

Happy tradeskilling!