Hi,
I don't know if it helps, but I had a similar wish today.
I wanted just to launch NX-OS to perform RADIUS authentication, using a Radius server, and use custom roles for users.
I didn't know how to use this VM.
I should have used Vcenter & Vsphere , related to the documentation, but I had only VmWare Workstation.
So I extract the ISO file from the archive for Vcenter to install the "VSM".
I installed the VSM using this document : http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/sw/4_2_1_s_v_2_1_1/install_upgrade/vsm_vem/guide/b_Installation_and_Upgrade_Release_4_2_1SV2_1_1/b_Installation_and_Upgrade_Release_4_2_1SV2_1_1_appendix_0101.pdf
And I blocked to the setup, because I didn't have the correct Interfaces.
By default, there is one interface for my VM. So I went to the data store of the VM, opened the .vmx file of it, and add 2 interfaces (ethernet0 was present, I added ethernet1 and 2).
Then the installation works. And for now I managed to do what I want, without understanding completely the role of the 1000V and configuring things that are not important for me now.
I hope it helps !
Brandon