when it comes down to the money you got to look at where your business is going to be (home or rent a place$$$$), then you got supplys(bedding,rat food, cages, hides, water, heating elements, ect., bills(which will rely on where you have your business), it would make since to breed your own meals for them, then are you gonna go with a website, advertise, and then of course price of getting your stock together. going to be ruff start and pricey. wish you the best of luck man,