Hello,
Norton is a Home / Home business product.
Uninstalling Norton from all systems at a time could be achieved through the SEPprep competitive product uninstall tool http://www.symantec.com/docs/TECH148513
VIDEO: https://www-secure.symantec.com/connect/videos/demo-how-use-symantec-endpoint-protection-prep-tool
Secondly, since you are in the Planning stage of installing SEPM / SEP on the environment, check these Articles below:
Planning the installation http://www.symantec.com/docs/HOWTO55061
Getting up and running on Symantec Endpoint Protection for the first time
Quick Access to Symantec Knowledgebase Articles of Symantec Endpoint Protection 12.1
Hope that helps!!