Dynamic Web Site

As long as I haven't find here what I was looking for - I will be more accurate: I want someone to build a website that will function as Wikipedia. It does not have to be build on Wikimedia format but it should act like one. For example: Login - everyone can register to the website, then he can add definitions as much as he want. Then I will get notice for a new definition and only I can confirm this definition - then it update in the website. Changes - people can change definitions but I will see the change before deletion/addition and again Im the one to confirm 3. Uploads - people can upload images. if they write a video link such as youtube, it will shown in a small live window (embed) (such as in facebook) 4. Edit - in the editor people can define a word or sentence as a link. 5. The web site includes various subjects, such as Movies, Self-details, Posts etc. Each subject will cover the page in its own color (background). 6. Definitions under Self-details are changable only by the writer and me. It is important for me that the freelancer will be available and connectable, and will finish the job into 7 days from closing deal. No need for design. The payments will run with milestones to agree between both. Thank you Daniel