Hi Jerry
Affiliate income comes from when you sell someone else's product or someone sells your product for a percentage.
If you find a person who sells a complementary product to yours that is not in competition, you can ask them to promote your product and you promote theirs. For example, when they sell their ebook they may have a thank you page that promotes your ebook as an extension to theirs ... and vice versa.
There are numerous different ways to do this, the main thing being that everyone benefits.
Writing articles has been a good opportunity for me. Things like a viral marketing ebook (See here:
http://www.dwave.com.au/ebdownloads/ManageEmail.pdf) which sells me two or three software products most months and depositing free articles that can be read by thousands (See here:
http://ezinearticles.com/?How-to-Download-an-Audio-Book-From-Your-Hard-Disk-to-Your-iPod&id=466617) An incredible 54,000 people have downloaded this article and hundreds of them visited my site and bought something.
I'd be happy to read and do a review of your book if you send me a copy and arrange an affiliate link using Clickbank or some other facility. I'll then distribute the review to dozens of free article sites like the one at the link above. You can contact me at emujoe AT gmail.com if interested.
Good luck with your ebook.
Robin
http://www.dwave.com.au
http://www.employment-one.com/blog