Content posting project

Hi, I would like to have a website where people can create an own place (field or something). They can either make their field open or close it and invite people to come and add content (pictures, text, audio, video). Others can see the content. That is the basic structure. The layout is very important. We have a detailed plan and layout ready. Only need the webdevelopment. Please, place your bid. On basis of your bid we will decide. (Detailed plan/layout will be given after the bid is accepted). Thanks