If you know what you are doing, you don't need gathering professions at all, you can make more money by buying stuff and selling it rather than spending lots of time farming and not really making all that much money. Gathering professions are great at the beginning of an expansion or if you really don't have all that much money. After that, they are a waste of time. The only farming that makes sense for the time you put into it is farming hebs or motes at the Tiller farm, because it's 5 minutes or less for 500-1,000 gold depending on your luck/server.
As for your two crafting professions, well, engineering isn't a very good money maker, never really has been. Enchanting can be very profitable. I made like a 1,000 gold off a 20g enchant in the AH because there were none in there and I was more or less being a twit and didn't expect it to sell, but people are lazy.