A couple of years ago I created an elearining on Building a Workflow from Scratch.  Recently I got back to some workflow work while assisting with a seminar for workflow.   Last week I added on to the workflow by creating start conditions.     Here are two more e-learning sessions to help extend the workflow from scratch.  

Using the event trace  shows you how to turn the trace on/off and how to use it to find out events are happening in your system, and also to learn which events are currently being used.

Extending a business object  walks you through extending an SAP Business Object Repository object, adding an attribute, an event, and using both in your workflow.

So, use these elearning sessions to help you get started, then be sure to buy the book and post FAQ's to the wiki!

Keep workflowing!