No, none of it's automated.
Create a thread with the following format.
Starting bid: 10,000TC (minimum bid that can be made)
Minimum Raise: (Smallest amount the bid can be raised by)
Autobuy: (the amount paid, to buyout the textures)
End Date (Date the auction ends)
Members will post their bids in the form of replies in the thread, when it reaches the end date or autobuy, you will send the members the textures through either an email attachment or a sharing website. They will send you the TC through the forums transfer function.
Has this cleared anything up?