Affiliate Link Generator
It's easy to make your custom affiliate link.
First click here, and then click on Affiliate URL
in the top menu.
This will generate your custom link for you, but remember that people don't like to click on long affiliate links.
So, you have 2 options, you can cloak the link so that it ultimately looks like your website with a short filename after it:
EX: www.mindrisehypnosis.com/offer
This requires that you set up a folder and FTP the generated file into it.
or
You can use http://tinyurl.com/ This is easier, but doesn't look as good because it doesn't have your recognized domain in it.