A practice room with NPC dummies that teach you a range of things that are essential for sparring.
An NPC that teaches you how to dodge bullets, an NPC that randomly moves around you that you try to shoot out, that type of stuff.
I feel like era's come far with NPC's so this could be a thing instead of just reading books about it, you can put yourself in the action and actually practice all sorts of mechanics.

A lot of era's stuff doesn't really teach players interactively, just mostly through images and text so I feel like this could be an amazing addition