…did you spend on site/s?
Affiliate marketers get paid selling for other people. If, for instance, you have a page dedicated to large dogs and decide to allow Amazon to post ads for dog books you recommend on your site, you are an affiliate marketer. You don’t have any books but the customer buys the book from Amazon and you make a small profit.
Been in marketing for a few years now. Learned all the tips at http://www.affiliatemarketingintro.com. A good basic guide site. And then went on from there. It took time to build up enough presence to make an impact on the net but it is well worth the effort