Google makes a cheap VR system. You will need a Google Cardboard VR viewer. You can find cheap cardboard viewers online.
You will need a smartphone with a gyroscope sensor. Most phones from [2016 onward?] have this sensor.
You will need grid paper to draw on. You can download grids from panoform.com and print them. These grids take a 3D surface and 'unfold' it into a flat plane.
Draw on the grid what you want to experience in 3D. The grid will be like the walls and ceiling of a room when viewed in VR.
Take a photo of the grid, filling the frame of the camera with the grid and drawing.
Edit your photo and rotate it so it is upright. Crop the edges to the grid on all sides and save.
Go to Panoform.com on your mobile browser. Adding the website to your home screen makes it easier to access.
Here is what the website looks like on a smartphone. Click on choose file to upload your image.
Upload your edited picture.
Turn your phone to the side.
Click on the small cardboard icon in the corner to load the VR version for viewing.
This will create a split screen version of your image for the cardboard viewer.
Open the viewer and put your smartphone inside. For google cardboard, this is very simple. For other headsets, you may need to 'snap in' the phone and match the midlines.
Close the viewer. Remove glasses before looking through the lenses and adjust as needed with your hands or using a focus wheel for the best image.
Explore the world you've created all around you! Use the focus wheel or your hands to adjust the image as needed. A chair may help if you experience vertigo.