There are a multitude of resources available to help you with Adobe Flash and Macromedia Flash. As you know, this book focused on Adobe Flash CS4 and ActionScript 3.0 as they are used and implemented in WordPress. Many of the resources listed below have information or tutorials about other versions of Flash and ActionScript 2.0, in addition to further CS4 resources that are not covered in the scope of this book. The list below is in no way comprehensive. It merely offers suggestions.
My learning process came from a number of different sources, some of which are listed below. Over the course of my years of teaching, I have also been a student. A fellow instructor, Abigail Rudner (http://www.rudner.com), was a great help to me when I first started learning Flash and using ActionScript 2.0. Many books exist that are specific to Flash and ActionScript. For books, I suggest hunkering down in a bookstore to look through the selection to find the book(s) that meet your needs for subject matter, proficiency level, and writing style. I hope you found this book helpful!
A reasonable resource for information, articles, and links to more of each on Adobe Flash:
Pre-made Flash components (for purchase):