[richardw]

Put your toe into the water, cheaply. Take one idea and start building your thinking around it, on 'paper'. Think about problems you'll have to solve, look at the market for it, maybe write some code. Think about what success with that idea would feel like - some ideas you might not want to follow for a few years.

This way you can try a few ideas without committing too many resources. Just keep moving forward every week until you find something that really grabs you and where you think you have an edge. Then hammer it.