Have you checked out the Viya 4 Github sites like this one? https://github.com/sassoftware/viya4-deployment
Here's the main official doc for Viya 4 Operations including requirements and installation. Viya 4 is still pretty new so there are not many Community users with firsthand experience, including me...
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.
Learn how to install the SAS Viya CLI and a few commands you may find useful in this video by SAS’ Darrell Barton.
Find more tutorials on the SAS Users YouTube channel.