I don't know if they still hand it out in the entry-level classes or not, but Crestron has a document called "Simpl Windows Primer". It's available somewhere on their website - if you can't find it, ask your sales rep, or email tech support or CTI.

In addition to that, checkout the Yahoo Crestron Programmers Group. In that group's Files area, there's a document called "Crestron Programming Workshop" which is a very informative tutorial. It's old, and a lot of the information is out-dated, but many of the core principles and procedures are still valid.