I would say start with something like pico 8. It's not necessarily 3D but is easy and has a huge community around it. You'll quickly be making small games so th

I would say start with something like pico 8. It's not necessarily 3D but is easy and has a huge community around it. You'll quickly be making small games so there will be confidence boosts. And eventually you can embark on creating the game he wants to make.