IP address (virtual?) for 4 VMs -- virtual MACs?

Hello,

I have a basic Hypervisor setup with 4 VMs.  The VMs show up in the ESXi interface with the hardware NIC and its physical MAC, but they are not broadcasting (port 53) to receive a virtual LAN IP from my DHCP server.

How do I make the VMs ask for an IP address?

Do I need to create virtual MACs also (so the traffic will know which VM should receive the virtual IP and subsequent traffic)?

thanks