Hopefully I’ll cover the main points here -
Earnings -
You basically build pages reviewing products or with other content, and add modules to ebay, amazon etc. Squidoo also add adsense ads to your page/lens too. If your lens sells 1 book and Amazon pays us $1.05 in affiliate income, we send a nickel to charity and [...]

 Sign up for a Google Adsense account to have Google place relevant PPC ads on your site. (The Yahoo Publisher Network also does the same thing.)
Create a Squidoo Lens and drive traffic to it. They share a percentage of the earnings with you that they get from the ads on your lens.
Sign up as a [...]