NEW Internet Search Engine - Ebay

I run [login to view URL] and want change it's function as it hardly gets any traffic. My idea is to combine a search engine with an auction ([login to view URL]) sites functions. Customers will be able to buy full page adverts to last for 1,3, 7 or 10 days as time goes on the adverts moves up in the ranking until it's gone and the customer places the ad again. As this is my first time I just want to know if it can be done, how long it should take and the sort of costs involed. ## Deliverables Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. Complete copyrights to all work purchased.