Hello,
I would configure one vSwitch using your only pNIC (vmnic). One VM port for VM networking and a VMKernel port for management traffic (vmotion having only one server is not a concern in your environment).
For VMs I would assign IPs in 10.10.10.X network except one VM which will have 2 IP one in both network classes and this will be the gateway for all other VMs.
This VM (I would go with Linux) will have 2 vNICs one in 10.10.10.X for internal lab network and another in 192.168.1.X network which allows this VM to have your LAN/internet access. This machine should route all packets from 10.10.10.X interface to 192.168.1.X interface.
If you google something similar to "How to configure a Linux gateway" you should find plenty of tutorials explaining this precedure.
...this is how I would do that, maybe someone else could give you a more useful advice!!
Hope this helps,
Regards,
Paolo.