The time you invest to make any significant amount of money is the same amount of time it takes to build a course or other offerings. If you want to make good money with ads (in the thousands), then you need to get 100s of thousands or millions of pageviews a month. This takes time and in that time you could just as easily build up your mailing list, create an infoproduct and make thousands whenever you want.

I have a lot of great ideas, but most of them are just thoughts and theories, and it seems that no one would want to read about, even pay for, ideas in which I am not a complete expert on. My greatest talent, perhaps, is being a prolific writer. Otherwise, I’m more of a Cliff Craven I know a lot about some things, and some about a lot of things. How does THIS make MONEY??
Once you setup your account on AdSense you will be given a code to add to your blog. This code will automatically display advertisements on your blog from companies who are part of Google’s advertising network. You may see ads from small companies related to your topic, or you may see ads from large companies that are completely unrelated to your topic.