Need professional PHP developpers

Hello everyone, We are looking for a freelancer or a team expert in php to finalize one of our website. Basically we already have the design, the member area and the register for 3 different memebership. Now we need someone to finalize and make the following for the lowest price possible: -''Advertise with us'' (payperclick system just like google adsense): A place where customers can create an ads and allow a time and budget. These ads will appear on our website. -Refer a friend: In exchange of succesfully registered friend the user will receive bonuses. -Announcement system (just like ebay ''buy now''): A place where users can put items for sale by categories. -Discussions section: Place where users can talk in forum style. -Groups (like facebook groups) -Search bar: Search bar where we can search for discussions, groups or announcements. -Social features: Add a friend -Payment interface: A place to deposit, withdraw, milestone (similar to freelancer payment interface) -Admin to control all this. We have complete details for winning bid