There is a Server Reference Manual along with the Server installer that you can download and use. To create a user in the Active Directory, you better get to your System Administrator. Once the user already exists in the AD, then you can add it to the QMC, Documents, User Documents, Authorization tab (DMS) or in the QMC, Licenses area.
If you are using DMS and Custom Directory, go to the QMC, System, Setup, Directory Service Connectors, Custom Directory, and add there a new custom directory and later its users.
Make sure the user running the service can access the active directory. If the user is a local user without network rights, QlikView will run fine but you will not be able to manually assign CALs in QV11 using the manage user tab (works fine in QV10 btw). To remedy this you can specify a different user in the QEMC: System > Setup > Directory Service Connectors > DSC@servername > Active Directory > specify path, username & password for a user with appropriate network rights > Apply.