Now that you have selected the hardware that you intend to use, the next step is to prepare the ESXi host you will be using for your Nested Environment.
My ESXi host is a HPE ProLiant DL160 Gen9 Server so I have downloaded the HPE Custom Image for ESXi 6.7 GA. If you are using another hardware vendor make sure you download the correct custom image.
I chose to install ESXi on a SanDisk 16GB Ultra microSDHC CLASS 10 Memory Card so that I could use the entire Samsung SSD for the nested virtual machines.
Once ESXi has been installed you will need to create a VMFS Datastore on the SSD.
For Networking, I am using the HPE 361i Dual-port 1 GbE NIC that is installed in the server. One adapter is connected to a switch with Internet Access, the other adapter is connected to a Ubiquiti EdgeRouter X. I use the EdgeRouter X to create all of the required VLANs and for routing within the nested environment.