This is great advice, but if it's too daunting right now to think about a market, just build something you would use. The experience of building anything is the

This is great advice, but if it's too daunting right now to think about a market, just build something you would use. The experience of building anything is the best start. Then, as you start to get ideas on what product might ultimately be a business, you'll have a better sense of what is possible and how one might go about executing on it. Most of all, as others have said - start building something.