Write a detailed specifications for App Development

I am looking for a skilled app development specialist who can help take our app idea from conception to having a development plan for an app to go to app development companies you must be expereinced putting together these plans including staffing, potential development cost, project timescales, design cost and all aspects of the app build. A wide ranging app that will include a datase tool for reporting problems and tools that will allow users to see aspects pf those tools reported and where they where reported from. Also a networking to to help match users and allow people to chat. Live chat system and news feed along with a camera function that allows you to record and send messages at the same time. Only experience app developers need apply with a proven background of developing apps