You may be lucky and find companies which already have online affiliate programs in place or are part of a larger affiliate marketing network. In that case, all you will have to do is get yourself connected to the program, follow the rules, and invoice your partner as necessary.
Basically, what it is you have a link that is this, only your affiliate link is attached to the end of it. Now you can add that to Facebook. You can refer this book to all of your friends on Facebook, and what it does is everybody who buys this book, get commission on it. You get 4% to 12%, 15%, whatever, depending on what your volume is.

What these affiliates don’t advertise is just how much goes into creating a successful affiliate marketing campaign. They rarely explain the marketing basics that people need to know and the numbers show it. In recent years this trend leads to a lot of people trying out affiliate marketing and failing. This gave affiliate marketing a bad reputation. But in reality, all of those people went into the industry without knowing anything. This is why guides to affiliate marketing and learning the marketing basics are so important!
For example, whenever you see coupons or discount links, most of the time these are affiliate links, and when you make a purchase, webmasters make money.