I would suggest looking at Juice (
http://www.symantec.com/community/). While the information regarding Workflow is not organized particularly well, there is some good information ranging from very basic to more advanced.
For a beginner to the software, there are some videos with names such as "Chapter 1: Introducing Altiris Workflow Solution 6.0". I believe there are 5 or 6 videos that are good at introducing the software.
The other options for just starting out are the online Workflow training at learn.altiris.com. This training is very basic, but is a lot less expensive than the full training.
However I would agree with matzebru that the best option would be Workflow Solution Foundation course. This would be the recommended path for someone serious about learning the product.