Set up a roadside stand. Depending on where you live, you could profit handsomely by setting up a roadside stand. If you live near a resort area, for example, you could buy cases of bottled water, put them on ice, and sell them to passers by for twice what you paid. Selling fruit and produce you grow yourself is also a smart idea in highly-traveled areas.
Customer Service is a necessary but time-consuming process for those who sell their own products. As an Affiliate, you aren't the product owner, and therefore aren't responsible for keeping the customers satisfied. Occasionally you may get Customer Service questions or requests from people who aren't aware that you are just an Affiliate. In this case, you simply refer them to the product owner.
How much will you make? I think my best month with Google AdSense was almost $5,000 over the last ten years. That amazing month blew my mind since it was actually near the beginning of my blogging journey. When you go from making zero to $5,000 in a month, that will rock your world. For me, it also got me even more excited because I knew there were other ways to monetize.