I just thought to point out that you can run all of the three of these on your page at the same time and experiment as I just have found out with full details at http://www.itcomparison.com/blg/advertising/can-i-place-google-ads-on-the-same-page-with-third-party-ads.html
So if you are new to this, its a good idea to mix between your Ads campaign choices, then figure out the one that work out best for you.

I hope that will help some of you enhance his earning.
Enjoy,
diggmee