Improvements to Wordpress auction site

I am currently running the Auction Wordpress plugin from Sitemile but need some features/modifications done to the site to improve it. The site is already up and running, and these are simply additions to the functioning site. Here is what I need done: 1) Option for Domestic/International Shipping (chosen by buyer before being brought to paypal) 2) Mark as paid button(If payments are done outside of the site, the option for a seller to mark an item as paid) 3) Send seller, buyers shipping information after payment 4) Update Tracking information, allow shipper to enter shipment tracking number that shows to buyer 5) Hide Expired auctions (For some reason expired auctions still show up, but say 0 Time left) 6) Accept terms and conditions before posting auction(Show terms and conditions, and force user to accept before posting auction) 7) Alert members to unpaid items(via popup that directs them to "unpaid items page(already on the site)) 9) Member stores (similar to ebay, members pay a monthly fee to have a store on the site and sell items.) As I said the site is already functioning as an auction site and just needs some tweaking/improvements. If this is a successful project, it may lead to future improvements on the site. Thanks.