Blaine,the administrators will add a section on the main page for us to make a post (just like starting a new thread) with our donations. Then the items will be moved into 4 or 5 forums for bidding. All forums open for bidding, but each closes on a different day (as Terry listed). To bid a on an item you just post on the thread on that item with your bid. Highest bidder at the close is the winner. Then you make payment and the administrators Mark the item paid. When marked paid the item is shipped to the winner.
Auction is a great time and raises a lot of money for a great cause.