Google and Google Adsense has free services to get everyone started in online incomes like
Google Sites and Blogger/(blogspot.com).
Google's services include their powerful keyword tool to do the technical part.
Google's Adsense has free programs that empower people online to earn money while displaying RELEVANT ads RESPONSIVE TO YOUR CONTENT online.
By creating helpful unique content as your intent, your traffic will grow naturally based on your helping others to understand internet and website dynamics.
You will need to develope and expand your keywords file as you develope your website(s).
Google's AdSense™ is a contextual ad program still evolving (by Google.com). This technology brings advertisers and site owners together with google acting as facilitator for advertising in their (your) websites. This is done using ads served on the Google Adwords Technology. The Adwords program is made by Google!
Ads in Google's adwords program are served on your websites. Revenues from these ads are shared between the web site owners and Google.
Google does not reveal how this revenue is shared.
Signing up for Google adsense program is very easy. Just go to http://www.google.com/adsense to begin.