I would recommend downloading Unity or Unreal as a starting point. They both give you an entire framework to develop on top of, and their VR support is getting

I would recommend downloading Unity or Unreal as a starting point. They both give you an entire framework to develop on top of, and their VR support is getting better with each release. We use Unity because it's way more popular with the local dev community here, but I actually prefer Unreal's licensing terms, as well as their documentation (I'm not a video person, and Unity relies on video tutorials a bit much).