One of the best ways is to "model" (imitate) what the vendors on Clickbank are doing. Check out the affiliate tools pages of some of the top vendors at Clickbank. There is usually a link for affiliates on the bottom of their sales pages. Notice what thay are doing.
The way to attract affiliates and get them to promote your Clickbank product is:
1) Offer a commission of at least 50%-75% to the affiliates. Usually most of the super affiliates won't touch a product unless they can get at least a $25-$30 payout on each sale.
2) Create affiliate promotional tools for them. This can include such things as clickable banners of various sizes, pre-designed landing/squeeze pages, pre-written email sales pitches (in .txt format) for their mailing lists, un-watermarked videos (so that they can watermark them with their URL and upload them to video sharing sites), pre-recorded sales audios, a "leaked chapter" or two of your ebook in DOC or RTF format, so that they can make a PDF out of it with their hoplink, and so on.
The ideas is to make it REALLY easy, effective and profitable for the affiliates to sell your product.
As far as what product to create, there are tons of ebooks on the subject. Also you might want to take a look at this:
Code:
http://www.instantpaydayformula.com/pdty/
or this:
Code:
http://www.nicheprofitclassroom.com/tips/product-creation-secrets.html
There's a lot of helpful info there.
Best of Luck
"Wiz"