This step involves signing up with a network like Amazon Associates to get your products and affiliate links too.
There are 2 ways to market affiliate products/services. You can either build a list or simply rely on traffic to your website so that people can read your reviews and place orders through those links.
There are many different ways to build an email list. For example, you can ask people to sign up on your blog with their email addresses in exchange for free content. You can use pop ups which prompt people to leave their email addresses when about to exit your site etc. Even with 500 people in your email list, you can achieve a significant sales volume.