Building a web site to generate ad revenue?

I see a lot websites with Google sponsored advertising on their sites. Where can I get real data on the type of revenue you can expect to generate using Google or yahoo sponsored ads. I`m in the business planning stage of a user generated site, and I am researching revenue model options.
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For example - Your visitor Clicks on the link, goes to the advertisers landing page... the advertisers goal is to have the visitor sign up for their newsletter. No payment is made (or received by you) unless the visitor actually does just that.
It`s a boon to advertisers, but could diminish the return on a site that uses google as income. Also - it unfortunatelly now makes your income based on the advertisers ability (or lack there of) to successfully set up a campaign to create the desired result.
Can anyone recommend any resources as far as books or websites that could help me get started?
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There are plenty articles about question you just asked. Good luck!