Here's my advice for getting started with the Connectome Workbench:
- First, go through my tutorial on plotting a NIfTI image; it also describes installing the Workbench and using wb_command.
- Read my summary of the different file types.
- Try the official Workbench tutorial (or at least look at the manual to get an idea of the possibilities).
- Look at my post on using the Workbench with volumetric images.