Windows Server 2012 r2: VLANs (Without system center or routers)

Hi guys.

I'm a student in computer science at university college nordjylland, Denmark and im studying Windows Server 2012 r2 hyper-v.

I want to make 2 VLANs in hyper-v for customers virtual servers, so i can assign a VPN to a vLAN, so the customers cant see his other without going out to the public internet and though the main firewall again. How can I do that in Windows Server 2012 r2 only?

I have tried using Hyper-v virtuel switchs with private, internal, external and NIC teaming without luck. Do I need System Center 2012 r2 to make these things?

Here you can see a an draft example for the architecture: