If you are not comfortable in penning down your thoughts through blogs and content writing, make use of your camera to create a video presentation. Create your YouTube channel, upload videos and start monetising them. Choose a category or subject that you want to make videos on and get started, but make sure it's a topic that will interest a lot of people. Everything from cooking shows to political debates can find many takers on YouTube. You have to create a YouTube channel, which works on a similar model as a blog. As you make your channel popular and the number of subscribers grows, so will your earning potential. The payment one gets is based on every thousand views.
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.
Many affiliate programs are run with last-click attribution, where the affiliate who receives the last click before the sale gets 100% credit for the conversion. This is changing. With affiliate platforms providing new attribution models and reporting features, you are able to see a full-funnel, cross-channel view of how individual marketing tactics are working together. For example, you might see that a paid social campaign generated the first click, Affiliate X got click 2, and Affiliate Y got the last click. With this full picture, you can structure your affiliate commissions so that Affiliate X gets a percentage of the credit for the sale, even though they didn’t get the last click.
Research individual companies in your desired niche: If possible, it’s always better to become an affiliate directly with a company (if they have an internal affiliate program), as no one else will be dipping into your commission rate. This is the preferred route for most of the prominent affiliate marketers, including Pat Flynn. Unfortunately, it’s also the most work, as you’ll have to do the research yourself to see who offers programs (they’re usually listed in the website footer).