>>337769704
Torch is simple toggles that you seem to know what to do already.
Camera most people use is this prefab that has a script to set it up. It's an amazing piece of tech, do recommend. https://hirabiki.booth.pm/items/2283183
For the pen I can post the setup I made for one when I get home later if I remember. It's just a trail renderer that's toggled on then manipulated with hand gestures to draw, pause and clear. Although I recall seeing a neat one on booth that allows you to pick up and move your drawings around too. I wonder how that works