This doesn't really answer your questions directly, but it's something that I've learned the hard way over the years: start small and fail early. Don't spend h

This doesn't really answer your questions directly, but it's something that I've learned the hard way over the years: start small and fail early. Don't spend hundreds of hours on ideas before you know if it will work or not. If your intention is to make money, make the smallest MVP you can to start testing if it has real potential. If it clearly doesn't work, move onto the next idea.