Here is some info for starters:
What is Google AdSense?
You'll earn when users visit your website and click on or view the ads on your pages, depending on the type of ad. Learn more about earning with AdSense.
We'll review your application and follow up with an email within about a week, depending on the volume of applications we receive. If you are accepted into the program, you can sign in to your new account and get the HTML code that will display ads on your webpages.