Hi msgood,
You will find some best practices to do this security configuration on this tech: http://www.symantec.com/docs/TECH188388
The section Solution contain the general steps.More information about configuring security for the Symantec Management Platform can be found in its user guide starting on in Chapter 4: Configuring security, page 69:
Symantec Management Platform 7.1 SP2 User Guide
http://www.symantec.com/business/support/index?page=content&id=DOC4730
Regards,