What is the first thing you sould do with an app idea ?
One of the first things should be to visualize it and exactly who would be using it.
• Can you identify potential customers?
• Are you following a trend?
Obviously, the app you create is one you would have on your own phone, but do you see a real benefit for others? Does it satisfy an existing need in a clear market?
I think answering these questions will help you to focus on your market in every single step of your project and prepare you to plan the development.