The coach should be finding the things you should be focusing on usually via a deep run you’ve previously had. This will give the coach a good overall picture of your game from all stages of MTTs.

For the questions to ask, what do you presently struggle with? Hand reading? Stack sizes? Opening ranges? etc etc. Ask your coach to give you whole range analysis and ask questions of “what to do with xx here”. This is the best way to learn so you can play a whole range, not just a particular hand.