I have a good idea for a phone app and was wanting someone to make it for me. How much would you charge me to make it, I don't know anything about coding.
Everyone has ideas. If you can't make it work by yourself, it's just another idea. As far as "how much", how much would you charge for "working"? Without knowing your idea, and whether it would take a week or a year to design, write, test and market it, no one can make even a wild guess.