Here are links to various products that can help you get started in the marketing field by understanding how Google Adwords works:

Google Cash, by Chris Carpenter, is a self help guide on how to make money by promoting affiliate programs via pay per click search engines, such as Google AdWords and Overture.

The Definitive Guide To Google AdWords, by Perry Marshall, is a self help course on how to drive more visitors and pay less for each one on the Google AdWords pay per click advertising program.

Google Adwords 123 is an advanced course that helps you write better ads and provides you with lots of advanced Adwords tricks that can skyrocket your affiliate income.

Ad Word Generator, by Rod Beckwith & Jeff Alderson, is a software program that helps you create and manage Google AdWords ads.