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.
I feel like if you have 98% only affiliate content and no other valuable content it’s more likely to be penalized. I was following a lot of competitor sites in Ahrefs and noticed all the ones that tanked had only thin affiliate content and no non-affiliate content. For some reason I thought FixYourSkin was yours but I was wrong. That site went down like crazy and lost their traffic by half. I saw them trying to recover by adding more quality content but it doesn’t seem to help for them and it’s not helping me either.
Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.
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Be sure to check what kind of customer support you can expect from your affiliate program once you have signed up. Do your research online and if possible, speak to other sellers using the program to get their thoughts. Can you speak to someone via phone or Skype or do you have to wait 72 hours for email responses? Be clear on this because trust me, you will need support at one point or another.