Given a description of what you want, I can design a wire frame of an application or a web in details, without leaving any step behind and in the process i would have achieve flow of how your application works.It only takes a day of detail analysis and finally a perfect application flow will be achieved.
What the Seller needs to start the work
I need a good detail description in form of a document.
I need a link for what he or she wants optional reference material
this two are enough but if the customer wants to add any document, He or she is free to do so I will appreciate.