The single most supportive thing you could do for them is to hook them up with like-minded peers.

If they have friends the same age interested in the same thing, there's no limit for what they can accomplish, with or without the other material.

Not only because peers can help out in finding and recommending "teaching" material, but also because as humans we tend to want to do what our friends do.

I think these peers can be people they interact with only online, and not in person, but that is my own conjecture. The rest is supported by evidence.