Very cool! My advise for beginners is to see the basic videos at Pixologic site, very helpfull to begin to work with ZBrush and I got a new course from Digital Tutors that it use only ZBrush to model a Cameran Dias cartoon and the goos part is that it use ZSphere to the base mesh and teatch about retopology that can make the ZBrush mesh have loops:

http://www.digitaltutors.com/store/product.php?productid=3529

Follow me at euQfiz Digital