if you're selling anything at all to do with food, there are a ton of legal restrictions - basically you have to be a tiny restaurant in terms of your kitchen and health standards, etc. That only matters if you get caught, of course, but in general selling anything food-related is a nightmare. FYI.
I don't have personal experience, so I can't say. I've tried a couple times to 'do my own thing', only to be plucked up by an employer. I think I make a great employee.
I imagine being 'The Boss' can be a lonely thing. If you're working directly with clients one-on-one, I can see an INFP doing fine. Just make sure all the terms are clear and simple between both parties up front. It's easier that way, if there is a mishap or misunderstanding later on.