normal workflow would be to model a low-res base mesh in maya, export it as an .obj,
then take this into zbrush. You'd then add divisions, add detail, then re-export the low level as an obj, generate a displacement/normal map, then render these in maya.
You can generate geometry/re-topologise in zbrush but it's not something I know much about personally.
just had a look at your other posts. I think you should work your way through all of the tutorials in Maya's help files, they will help you out a lot. Then you can google tutorials for modelling, texturing, sculpting etc, you'll find plenty for free on the net.
Last edited by gubar; 15-10-2011 at 09:41 AM.