Outbrain is not necessarily the network of choice, it was just an example. As for tracking the ROI usually you'll want to track campaigns in Google analytics and track clicks on affiliate links as event and average value/email or you'll want to duplicate the post and run paid traffic to the duplicate so you know exactly what the conversions are as you can put them in separate email lists etc too.
Affiliate marketing is also called "performance marketing", in reference to how sales employees are typically being compensated. Such employees are typically paid a commission for each sale they close, and sometimes are paid performance incentives for exceeding objectives. Affiliates are not employed by the advertiser whose products or services they promote, but the compensation models applied to affiliate marketing are very similar to the ones used for people in the advertisers' internal sales department.
Making Sense of Affiliate Marketing is a great learning tool, even if you are a brand new blogger. By taking this course, you will start off blogging the correct way. You can learn from my affiliate marketing mistakes and learn the best ways to start making an income by being an affiliate. Through taking this course you are sure to grow a profitable blog quicker than the average blogger, as you'll learn exactly what you need to know about affiliate marketing. So, even if you only have one blog post, you are ready to get started with this course!