Welcome to the community.
I’m fairly new here too, but perhaps these tips will help you:
- First off; I don’t think it’s possible to play a game through VU completely without internet. As you need to connect to Zeus Backend to even be able to play through VU.
- There are plenty of servers around that don’t have population but have the fun-bots mod enabled. That’s one way to have a sort of offline experience. However you can’t really choose the desired map or set it up to your own liking.
- Another option is to create your own local server and don’t forward the required ports or put a password on it. I found that this way I could join the server, while no one else could. This way you can tweak the server to your liking and you can even use Procon to make things easier. Set-up is quite easy if you just follow the steps here: https://docs.veniceunleashed.net/hosting/
Hopefully this helps you out a bit. I might have missed something, so maybe other members could provide you with more options.
If you would like to have a taste of how the experience could be, I don’t mind setting up my server to your liking and let you have a go at it.