I think you should start something very very small and forget about the money part for now. For me, my most successful project ideas came from problems that I faced during my own site launches. Since you don't have much knowledge of FE development, I would suggest you keep things Simple Stupid and try to do as much as possible with HTML and jQuery. I have created really complex websites using just PHP and jQuery (sit…
If you intend to switch to money later, you should probably at least validate the idea before having a great time building something only to find out no one wants it.