Once you've decided to take the plunge into affiliate marketing, the first few thing you'll need to know is how to find, choose and sign up for an affiliate program.
Once the merchant has approved you for their affiliate program, you'll also need to know how to grab the media assets (banners, text links, etc.) and add them to your site.
I've previously covered "Choosing an Affiliate Program" in depth, but I just came across this recent infographic from The Performance Marketing Association's Publisher Recruitment Council, which sums it up in 3 steps, and is perfect for beginners.
Download How to Sign Up for an Affiliate Program in .pdf format.