There are loads of resources for making money online as an affiliate. You could source products from ClickBank, Commission Junction, Rakuten Marketing, Share-a-Sale, Impact Radius and many others. Plus, many of the larger companies have their own affiliate programs as well. Do your due diligence and find the right company with a relevant product or service to your audience that you can sell as an affiliate.
In some cases, you will need an active website with substantial traffic to get approved. Selling as an affiliate isn’t easy by any means, but if you do have the audience, it can definitely amount to a substantial amount of income.