True creation of an app for iOS, android or for any of the rest platforms comes with the idea. This idea you might have is the true beginning. This is important in many ways. First the idea you have is unique, it won't require skill or experience in app. If you have idea for, or need for app that can do needed tasks for you and there is nothing that will suite you on the market it is most likely a unique and profitable idea. The goal for creating a useful app that no one has made is profit, being that profiting through your job or directly by selling your app on the market. And there is no other condition to success. The idea is all that you need. Of course that popularity of an app is tightly connected with design, stability and security but you can find people to do all of that for you.