Documents, pictures and video management backend for application update

We are in need of a graphical web interface to manage content that is pulled from an ipad application. The content is divided in 3 parts: documents, pictures galleries and videos. The content can be assigned to a specific user ID The job is to build a graphical web interface that will permit to upload, manage, delete content, manage users and assign content to users. The UI must permit to define an order of presentation of each type of content, and permit to order the pictures in each gallery in a drag and drop manner. Mysql database schema already exists and will be provided. This project is simple.