[Siri]

You'll want more than one helmet (especially considering you want to teach others). Try for auto-darkening, you'll thank yourself later. And I would try to find someone with some solid experience, even if they can only come a few times. Local machine shops, etc might be a good place to start.

My only experience is with MIG welding, and nothing spectacular at that, but think of basic cleaning tools as well. At the least some steel wool and a chipping hammer would start you off. I'd think you'll want an angle grinder at some point, though we waited a bit to get ours. And of course the ever-necessary C-clamps and jig materials, which you probably already have. If you were going MIG you'd have to deal with slag on them, but I don't think TIG has any similar problems.

TIG has some consumables too, stuff like lenses and collets, though I don't know much about them. Not horribly expensive, but something to keep in mind price-wise if you're not already.

Good luck and stay safe! It should be a good time.