If you've never used Mudbox before, begin by watching the one minute movies that appear on the Welcome window when you first launch Mudbox. These movies contain essential tips and tricks for using Mudbox.
To begin learning the main areas of Mudbox, continue with the QuickStart tutorial. You’ll learn how to load a model, navigate the 3D View, and the basic sculpting and painting techniques.
If you cannot perform a function, find a feature, or just want more information on using Mudbox, consult the Mudbox Help as follows:
Beyond that you can view short movies that demonstrate Mudbox features and workflows in more depth here:
Learn more about Mudbox, post questions, and exchange ideas with other Mudbox users at The AREA's Mudbox Discussion Forum: