You use an outside site and pick one of their templates. Sites such as Auctiva, or Sellers Sourcebook. Then when you make your auction template, make it in a general way, especially if you have a lot of the same cards. If you have one of many different cards, you can still make the auction details general, and just change out the pictures. You could also list cards in a lot, group them together with like cards etc.. and sell them in one auction. Good Luck!