Hello, Im new to mobile marketing but I have a nice idea that could potentially climb to top places of iOS or Android platforms. I have developed some sketches of a rough idea how the app will look and im wondering should I try to sketch everything and link everything to how it should work? or because I'm going to hire a freelancer to develop it should I speak to him about it or I should have everything ready before I do? And the other thing how do you decide to trust the freelancer that he wouldn't like the idea and make it his own instead of making it for me? Thanks in advance.