With 8 hosts, and 2 sockets (not more than 32 cores/socket) each, you need 16 Enterprise Plus CPU licenses. In addition to this - as Scott already mentioned - you also need 1 license for vCenter Server Standard for management.
If you didn't previously purchase an "Acceleration Kit", you can get one of these, which help lower the total cost.
An Acceleration Kit is basically a starter kit that comes with 1 instance for vCenter Server Standard, and 6 CPU licenses. These Kits are available as "Standard", and "Enterprise Plus" kits, so make sure you get the right one.
Putting this together, what should cover licensing for your new environment is 1 "Enterprise Plus Acceleration Kit" plus 10 additional "vSphere Enterprise Plus" CPU licenses.
André