Services and goods auction site for builders

I am interested to prepare a specification document that would be later used to develop a mobile and web app. The app would be used for people planning to build their house and through the app they can post auction for contractors to provide them work, products or services - relevant for each stage of the building process. I need a freelancer to prepare that document that would include all relevant wire-frames, use cases, data and table structure, navigation flow and to have all relevant components so a development company can later develop those apps for me. the document should relate both to front and back ends, different user types, data flow and so on.