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.
#2. Site Build It - Site Build It is my second choice for learning how to create an online business. The training is very good and you get one website with hosting included. There is no free option, which is one of the reasons that it is not my first choice. I started here back in 2007 and the education that I received was very valuable and helped me to achieve a great level of success.