The ESXi host just needs to have a connection to the specific network / VLAN, where you want to put your VMs into.
The assignment of the IP addresses remains the same as it would be a physical box. No need to first configrure these IP adresses on the ESXi host at first. Your ESXi host need only IP addresses for the managment-network, vMotion and may some for the shared storage connectivity (NAS / SAN).
Regards,
Mario