Fun & Challenging Website to distribute mobile contents

I'm looking to develop a site that allows me to distribute & create contents to mobile users in North America, Europe and Asia, and to create a mobile community. The contents might be games, wallpaper, graphic, ringtones, etc. A good example of the site might be [login to view URL] I want the site to be easy to use, and if possible, it doesn't require the user to pay any data transfere fee to their phone service provider. In addition, i do not wish to pay any gateway fees so please suggest other alternatives - ideally, it would be best if you can provide some sort of script that I can send SMS links to the users so they download the contents with ease. Furthermore, the site should contain 2 areas, one for users to download, and the other for providers (such as games, etc.) to upload their products. There should also be a backend for the admin area of course. I don't believe in jumping from one coder to another so I'm hoping to find one that I can work with in the longrun. Lastly, I have prepared a document of what I want for the site so it should cut the gathering requirements process short but before that I need you to sign a NDA.