ClickBank is the Internet's premier retailer for digitally delivered products. From ebooks to software, they offer customers a vast array of digital goods. ClickBank is the pioneer in selling digital products worldwide through the leverage of over 100,000 talented and proven affiliates.
Once you join ClickBank you'll get a unique username that will be incorporated into the URL for every product you decide to promote.
Affiliate products from ClickBank should be linked into the post.
It's a simple process to write one or two blog posts about something relating to that product (without directly selling it) and inserting a clickable link in a relevant place which goes through to the product you want to sell. Every time someone clicks through and buys it, you make some money.
Try linking to different products and make sure they are relevant to the overall subject of your blog. Think about what your readers are interested in and then do a search for some products you think they'd like. You can do the same with Commission Junction if you want a wider range of products to promote.