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Remember also to check that material you read is up to date as the internet is constantly evolving (particularly at Google).
The Definitive Guide to Google Adwords By Perry Marshall is the most comprehensive I've seen.
Google Cash By Chris Carpenter Is one of the most popular & the one that got me started.
Google Profits By Wade M. Winger is also an easy read & a good basic starters guide.
Good Luck with your endeavours.