If you have a spare computer, install proxmox on it.
There are loads of tutorials how to do this, it has a good installer, after which it’s all a web based GUI.
Use it to spin up VMs to your heart’s content, create scripts to automatically provision a new Ubuntu or Debian or whatever flavour. Or run up some Windows VMs. You can pass through GPUs and other devices (tho this can be difficult, again lots of tutorials out there).

Be prepared to spend some time learning proxmox. It took me 2 or 3 installs to figure out the best way to set up networks, storage etc. Mostly cause I just jumped in, found something that could be better, googled that and found a useful tutorial on it so started again.
But once proxmox is running, everything else become so much easier