possibly just talk about what you're selling and then give them the link upon bid, if its resellable that is
If you have resell rights, you can first make the sale using graphics/images and afterward send a zip file by e-mail or let them download from your site. Just like ColaDesigns said.
That's correct. Resell rights must be verified. In depend what you would like to sell it's a good idea to give away freebies.
But why you need that.I think you cant.Because clickbank products are non auctionable. i.e. fixed priced. If you wish to join a coaching see this starturl.com/learn-n-earn You can become affiliate
I market Clickbank on Ebay. What I have done is spoken to a CB Author. He has given me 3 sample Ebooks (just short previews). I sell them for 0.99p (UK!!) and put my Affiliate link in the advert. So, either they click through on the advert, or they buy the preview ebooks, which I Email to them - again outlining that they can get the FULL Ebook from (LINK). I have had some success from doing this.