Hi Mo -
I’d start learning modeling with Silo - its a relatively simple, inexpensive program that has some amazing tools. You can learn all the basic principles of polygon modeling there and that would all translate to Maya later if you want. Also, the models go into Zbrush no problem.
A lot of people seem to do some great work with zspheres - but until v 2.5 you dont have a lot of specific control over the flow of the mesh.
You might want to check out Zack Petrock’s Gnomon DVD - a cool way of working if youre more comfortable in ZB than Maya. I kinda followed that process here.
Just my 2 cents…
S-