How to setup an IP range and IP Pool for vm's

OS type and version REQUIRED
Webmin version REQUIRED
Cloudmin version REQUIRED

I haven’t been able to create or see one virtual machine? I want to set up 10 or 50 vm’s, I herd I need to set them up with an ip range and an IP pool. how do I set the ip ranges and setup the server and vm’s? I am using nvme server. also, do I have to buy an IP range, or can I just get one IP and create a range?