What licenses and how many should be taken for SQL Server 2012 Standard Edition

Hi,

Could you help me please with my problem: what licenses (per core or Server + CAL) should I take for SQL Server 2012 Standard Edition for the following environment:

SQl Server will be installed on VM with 1 core.
Physical processor is Intel Xeon CPU E7-4830, 2.13 GHz, 2131 Mhz.

Few people will have an access to the VM but SQL server is used for a web-application for about 200 users from Active Directory.

Great thanks in advance,
Lena