[TonyHaenn]

I think the software is the easy part (and that's still hard). The harder part is finding a problem that people will pay you to solve. I'd suggest for each of your ideas, you try to validate that there's a group of people that you can reliably find and talk to (marketing) about the problem they have. Only build something once you have confidence you can sell it.

I like the book the Mom Test. Easy read, and gives some really practical tips on how to talk to people about their problems. Focus on the problem first and wait to build something until later.