This is also what I wanna achieve. My average adsense income is $2 a day. $14 a week. Hope It will increase.
I would use yahoo ppc marketing. Google is to risky. I would also use CPA networks however to get expected to many of them you need to some experance so I would use clickbank to get started as it is easy to use and to get started with it. I would just start out by using long tail keywords so you are not bidding for very high for your keywords. Don't pay more than 0.25 cents per a keyword or a set of keywords. That should be enough to get you started. Above all do research and do more research and do more research.
You must be earning a lot of money. I checked your site in alexa nice traffic. Why don't you use Parked by domains? My be you can earn $100 or more as you have a good traffic