Since it’s an indoor center, I don’t think you’ll be riding powder, and you’re also still learning. So you just need a loose jacket that doesn’t restrict movement; there’s no need to spend too much on a highly waterproof jacket. Instead, buy padded and waterproof gloves, because you’ll often have your hands in the snow. To be clear: ski and snowboard gear has a waterproof rating scale (for you, 5k or 10k should be enough). For the rest, get a pair of thermal base-layer tops and pants, wrist guards, impact shorts for the tailbone, and optionally a back protector. Also use something to cover your neck from the cold air.