Create a Store script is already there

Needs help with my website There is a script for eBay I have a small remodeling needs. I would want that this Auzion the value of the running back not by price top as on Ebay Sun Dern-price Example: car $ 200 1st order $ 195 Second order $ 190 Third order $ 185 winner 321 My Backwood auction ... ... ... ... ... The Shop of 100% is yet to be installed modules, modules all existence must be halted only by a professional.