Two Tools so you can answer this question on your own: 1. Google AdSense Earnings Calculator 2. Overture Keyword Price Checker Now all you have to do is estimate a CTR. I would say 2-5% for an entertainment website is good. The overture tool gets the price advertisers are paying for certain keywords on the YPN(Yahoo Publisher Network). The price on adwords may be a little different, but they should be close