Trying to Learn an Affiliate Marketing System

Shawn Collins of answers a question about finding a system to learn affiliate marketing. QI have been exploring & investigating the industry of Affiliate Marketing. I have read quite a bit (including your blog), and have tried learning a system. Consequently, I spent some money and they used Clickbank to process the sale. Clickbank doesnt seem upfront as I found unknown charges on my card. Do you knowfind clickbank reliable?