Thanks guys!
I'm not starting the next insulation phase in the new framing. I have been overestimating the amounts and finding that it's much cheaper. Well Mineral Wool insulation isn't cheap, but I thought I was going to need 3 times more than I really do.
Same with drywall. I think I'm gonna need about 1000 sf of surface to cover. So I think that will be about 60 sheets of 4x8 drywall sheets.
I was originally thinking I would need double that... I can't imagine having 120 sheets of drywall stacking in the garage.
Remember to soundproof I will need two layers of drywall, otherwise I would only need 30 sheets.