What to focus on?

I am new to VR and I want to be able to set up little scenes just to see if the dimensions are right. Does it “feel” like the right size to the viewer etc. When I am done building the models and placing them in a scene, how do I load them into the VR environment so I can look around and see if it is what I want or not?

I plan to get a feel for the over all work flow build up from super simple scenes that are not necessarily games into something bigger as I learn. Right now I am just trying to compile a list of all hardware and software I need to do the whole thing. I will probably buy them as I learn them over time etc.