There are a number of books on Crystal, ranging from one of the "Dummies" series to some advanced books. I don't know of a Sage supplied tutorial although Sage does have some trainingg classes on both Crystal Reports and the Data Structures. Your reseller may have a class or can suggest one.
The traveling seminars on Crystal lack any connection to the Sage Data Structures and may not be very helpful if you are just starting out. Ideally for Crystal Reports writing and MAS90/200 you need a good overview on the Data structures so you know where to find the data and the basics of Crystal.
Russ Nobbs
Founder, Rings & Things, Spokane, WA USA
