Garage Listing room

It would work if you put something on the walls over the insulation, like drywall or plywood. It will sound dead with just the insulation.

Mine is 17x24x9. Yours will be fine. Use 5/8" sheetrock, it blocks like twice the sound of 1/2" for almost no additional cost. There's endless things you can do, the trick is to figure out which ones like the sheetrock trick cost next to nothing but deliver results big time. Usually only people who have actually been through this proces know these things. So be careful, because a lot don't, but act like they do.

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Since your walls aren't yet finished, there are a few things that are relatively easy to do right now while the framing is exposed. There are various construction techniques and materials that will help reduce sound transmission, both outside noise getting in and inside noise getting out. Which ones will work for you depends a lot on how things are laid out and where the noise is coming from/going to. The garage door I would think will be a major one. You will have to decide either replace it with a wall or seriously modify it to be more like a wall.

Also be sure to run your one dedicated line now before sheetrock. One line direct to wherever your system will be, another circuit for all other outlets and lights. 

There's a lot of options. Some like 5/8" sheetrock and single dedicated line cost next to nothing but deliver big time. Others, well you can spend thousands and not hear more improvement from a $200 fuse. So don't sweat the room. 

Without modification it's probably going to be a fairly dead sounding space due to all the exposed insulation. Are you willing to do modifications or would you need to use the space as-is?