The auctions on this site are at this board:
http://www.net54baseball.com/forumdisplay.php?f=22
You set the ending time of the auction, the minimum bid, the minimum increment, and the shipping costs if any. Then the highest bid as of that time wins the lot. There are no fees. You could also post them in the 1980s-present Buy/Sell/Trade board here at a fixed price or best offer.
To get maximum value from eBay or an auctionhouse, you'd have to send them to BBCE to get authenticated as real unopened packs.