Classifieds

I would like to have a Reverse Classifieds site built. The site will consist of an Admin account w/ a control panel. A seller account which will be created by the Admin. A buyer account which will be created automatically by the buyer. The buyer will create a request and the seller will be able to post their service or product "similar to get a free lancer" The layout should be simple yet professional, and easy to navigate. Please include some samples of similar work. More info is available upon request. Thank you and Good luck.