In terms of the licensing to get a better understanding I suggest that you look at the following:

http://download.microsoft.com/download/7/3/C/73CAD4E0-D0B5-4BE5-AB49-D5B886A5AE00/SQL_Server_2012_Licensing_Reference_Guide.pdf

However, it is always best to speak with your Microsoft representative as well as the reseller who provides your company with licenses.