Web Site Marketing, and Web Site Administration ar ethe two topics here. There is a huge source of info available on these.
One link describing this and providing a free module that simplifies adding Google AdSense advertising to your site can be found at http://www.mitchelsellers.com/Blogs/tabid/54/articleType/ArticleView/articleId/94/Integrating-Google-AdSense-with-DNN-452.aspx.