>>287945650
If you're looking for somewhere to start, you can check out the unity learn site. They've got a lot of sample projects and tutorials, and all the premium stuff is free for the next few months. The beginner stuff I've looked at so far is super simple, but it's been nice for easing myself back into Unity dev, and you can dig through their sample code to see what they're actually doing.
https://learn.unity.com/project/vr-beginner-the-escape-room