If you have a Professional or Enterprise subscription to DPS, consult the Adobe DPS Getting Started Guide (PDF).
Colin Fleming created a series of videos on using the Digital Publishing Suite tools. These video tutorials and others are available on AdobeTV.
In addition to the videos in the DPS Learn channel, a number of other videos are also available in the AdobeTV - Digital Publishing Channel
To get a basic overview of the DPS workflow, download sample assets step through Authoring Tutorials, and experiment.