You can look at the ISE ordering guide for SKUs
https://www.cisco.com/c/dam/en/us/products/collateral/security/identity-services-engine/guide_c07-656177.pdfYou will need esxi/vmware licensing, or another supported hypervisor ISE can run on.
For ISE licensing though;
1. You need to buy a VM license per ISE VM you deploy, they come in small, medium and large and you order depending on the required scale. Each VM template from 35x5 to 36x5 fall within these three models.
2. You will need ISE authentication licenses, base, plus, and apex depending on the features you plan to leverage.
The ordering guide covers the use cases for endpoint authentication licensing.