I knew that question would be asked,

one was 'Adwords Secrets Revelaed' by Larry Johnson
And another was 'top 37 Adwords pay-per-click secrets' by Roger C Hall
Theres probably loads of others available now as these are a few years old and i bought them when starting another business unrelated to carpet cleaning and then subsequently used what id learnt for my cleaning business.
They help you understand the concept of adwords and how to make it work without chucking loads of money away, and its not as easy as what you think but takes a bit of time and dedication.
Once you understand how they really work, (and google doesnt really make this clear), then you can use the know how for any business.
One common mistake is to have one ad and then stuff it full of all the keywords related to carpet cleaning and then hope someone clicks on it !
This is probably what google wants you to do as it makes them a lot of money, What you really should do is mentioned in the book

Regards
Steve