Windyguy,
I dont know....it's any area of the web i never knew to much about, and the only thing i haven't tried. I starting building a cj site to test it and see what happens. I guess all you can do is research, research, research. Go to all the boards and run searches on cj sites...see what people are saying. That's where i started.
I'm convinced that there's money to be made from all my research. Just gotta figure out which sponsers to use, and how to present it. Most of this will come from experience with your cj site, and testing different sponsers. So my advice is just do it and test out different way of promoting.
Just carefully read each sponsers rules. And let me stress the word "carefully."
As far as the pop-ups, i've been against those since day one, 6 years ago, when i first got into this business. Be careful on how many you decide to pop up. The point is make money and NOT crash the surfers browser. I would say 2 pop-ups maximum. I'm starting with one just to see what happens, but i wouldn't go higher then two.
Just my 2cents worth. And don't take my word for anything, i don't have the experince in this area. This is simply my opinion.
Good luck, and please share your experiences in the future.
Hopefully more experienced cj webmasters will add there comments.