If you're new to game development, then I recommend not worrying about VR too much and just focus on getting into the swing of things by getting it running on a single traditional desktop platform. On the other hand, it's good if you can keep in mind future platforms and features while you're developing, and I like to do a bunch of survey and reference reading before I get started on a new project, so I recommend doing as much as you can of that without getting overwhelmed.
Which brings me to plug a book by a friend of mine
https://www.routledge.com/Building-Virtual-Reality-with-Unity-and-SteamVR/Murray...