You can also get lots of FREE advice at the source.
Amazing how many buy ebooks when they have not even studied all thats available right at Google.
Google Adwords Learning Center.
AdWords Learning Center
"If you're an AdWords advertiser, Google Advertising Professional, or just interested in learning more about AdWords, you can use our free training to sharpen your AdWords knowledge. We offer both multimedia and text lessons to match your preferred learning style. While lessons are organized to build upon previous ones, you can skip between topics and take them in any way you like. After each lesson, test your knowledge by taking a quiz. Because so much is covered, you probably can't complete training in one sitting (without the help of caffeine), so return often. Content is updated regularly to keep you current."