ZBrush comes with a bunch of beginners' tutorials. Just press the help button at the top right and start at the beginning. They're all zScripts that walk you through the steps and show you the moves right there in your interface. I find it useful to have two instances of ZBrush open at the same time so I can run the tute in one and follow along in the other.

View Ajax's Gallery - View Ajax's Freestuff - View Ajax's Store - Send Ajax a message