Here's a great white paper about starting Google AdWords. It provides the basics on setting up a Google AdWords account, researching keywords, writing ads and more. It's a white paper provided by Brad Callen and it seems to promote Keyword Elite (a software tool you can purchase to create keyword lists). The white paper doesn't hit you over the head with a sales pitch. It's a really helpful guide and I hope you enjoy it.
http://www.dave57.com/keywordelite/adwordsmadeeasy.pdf