Are you just starting your first online business and not sure whether you want to be a product creator or affiliate? Personally, I prefer being an affiliate. It's not as glamorous as owning your own product, but I think it gets much closer to the idea of passive income. Check out how affiliate marketing creates passive income better than any other type of business.
Paid traffic, such as PPC or banner advertising, is usually more controllable and scalable. If what you're doing is working, you can spend more to grow your traffic. It also has the advantage of being able to start very quickly, if not immediately. The main disadvantage of paid traffic is that it can be quite expensive and requires a lot of supervision to avoid losing money. Paid advertising platforms such as Google AdWords can also have strict requirements regarding advertisers and ads, so be sure to pay close attention to all rules and warnings.
ClickBank represents primarily digital or downloadable products. These typically have high-percentage payouts to affiliates. The commissions average around 50%. You do need to be careful and closely vet all products. There are some great products, some good products, and many crap products. You need to be sure the product and the promotional methods are appropriate for your audience. But ..