Can I create paid apps to sell?

The short answer, not right now.

Letting users create paid apps is a little too complicated for us to handle right now, so currently the only option is the ability to create free iPhone apps. If you want to create a paid application, try hiring a developer to create one for you and introduce you to the App Store’s development process. We’ve recommended a few on the bottom right of our support section at https://www.freeiphoneappmaker.com/contact/