In addition to learning 3d modeling packages, have you emphasized the importance of learning 2D foundational art skills with your son? Artists who have an analogue drawing background tend to produce superior work, particularly when it comes to sculpting due to having intimate knowledge of forms, tone, color theory, etc.…
3D studio max seems the easiest to learn and most forgiving. It's less complex than Maya (no history, no complex node management) and more intuitive. Especially for modeling the modifier-based workflow is pretty well suited for a beginner and for a clear and logical step by step approach. I actually started and taught…
I started with 3D Studio DOS (must have been 14 or 15 or so), then moved to Cinema 4D because Max was inconsistent as hell. The very first things I created were much simpler than poly models - mostly lofts and lathes and objects build from a combination of shapes. Later I did some poly modeling. I think the whole UVing…
I started with ye old gtkradient and its bsp tools. It gave me a good sense of 3d space early on and I found it fun because the results were immediate. Allowing me to play with what I made. After that I found Maya which didn't seem that complicated after gtkradient. If I was my younger self now I would most likely try to…