Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with printing, warehousing, customer service and so on. The site has over 2 million independent designers that have created products being sold online here. If you have some graphic design skills, then this is a great potential source for your web-based income.
My advice is to model something that already works. DO NOT try and be creative in the beginning. You can get all fancy and creative once you're rich. Emulate before you innovate. A good direction would be look for strategies that are pretty stable and haven't changed much over the years. Because you don't want to invest all this time and resources into some magical hypey fly-by-night strategy.
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.