Build a report using the expert, and investigate what you get. The experts are pretty good. They can probably generate 85% of the reports you'd need, depending on your database organization and business rules.
I'm not aware of any books (not to imply they don't exist, I just don't have any of them). I started with CR 5 and I'm currently using CR 8.5. I think that's the latest version. If you have specific questions, I should be able to help you out.
Brian Bronson