At the risk of sounding less than helpful or pessimistic, the first thing that jumped out at me when reading your post is that you are going about this backwards. I'm not saying you can't or wont' succeed. I have no idea. But it seems like the first thing that happened is that you decided you wanted to start a business. Usually it's the reverse - you get inspired by discovering a problem and realize you have the skil…
It sounds like you are describing the Silicon Valley ideal, but things like "finding a good business to start" are very much a traditional approach, and I am confident they will teach you about how to do market research to this end in business schools.
And I'm not sure business schools are a big help here. The vast majority of MBAs end up joining mid-sized to large existing companies as high flyers, and I think the curriculum aims to support that.