This is a really broad question, I think it's going to be hard for people to answer you helpfully. We need to know more details about what exactly you want to do. For example, do you intend to open a storefront cupcake shop, or do you just want a custom business that can be run out of a commercial kitchen (or your home if your state has CFL)? The answer to that question alone is crucial in the kind of advice and help we can give.