This project is for the design (artistic freedom allowed within reason) of a business web application. The application must be designed as a Single Page Application (SPA) similar to Google's GMail web UI.
The first phase is for graphic mock ups (realistic) of your design which will then be followed with the PSD to HTML / CSS conversion of the approved mock ups.
The attached file contains an early draft of the UI requirements document, but should be enough to do the graphic mock ups from.