Hello, to all i just got ZBRUSH 4 i don’t know how to use it, but i am glad to be amongst such talented people and hope to be as great as you all are. i have a cintiq 21, i finally decided to invest in myself. hooray for me. 
i know this sounds stupid but i have been a very good artist for a long time(so i have been told) and just never did anything with it. that changes now! glad to be aboard
Welcome!
ZBrush is indeed intimidating for anyone coming from a “box modeling” background. There are allot of things ZBrush does different, the one stand out point is probably sculpting. Learn about: Keyboard shortcuts, Zsphere, Polypainting, UV maps, how the tools work and brushes/alphas. There tons of free video tutorials on the website check them all out.