Connecting Switches to ESXi

I need help with what the connection should be like. I Have 20 CSR1000v VM installed already on ESXi 5.5, but I am having issues with what connection goes to the internet and which goes to the ESXi.

And what config is suppose to be on the switch that connects to the ESXi server.

I will think it is just to configure the port as a trunk port.