You can succeed. This is often the best way to kick off a business - you still have a regular paycheck and can afford to invest in the business. At some point in the future you'll probably need to have one of you go full-time, but you can cross that bridge when you come to it. As far as how much capital you'll need, that depends on the business. Incorporation is a good idea depending on how much revenue you're bringing in. How much does this cost? How much does accounting cost? It depends on where you're located, but you're probably looking at a few thousand a year.