Someone who does affiliate marketing is a sales person for an outside company. The affiliate marketer receives a specific percentage of each sale he or she sends to the company. To track orders from affiliates, companies give each affiliate their own special link. Affiliates send people to the company via these links, and when people make purchases, the affiliate receives a percentage of each order.
You should also make sure you aren't competing with your own affiliates for eyeballs. Any marketing channels you're using, such as search engines, content sites or e-mail lists, should be off limits to your affiliates. Put marketing restrictions into your affiliate agreement and notify partners immediately. It's your program--you set the rules. Or, if you prefer, you can let your affiliates run the majority of your internet marketing.