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Be sure you have plenty of electrical outlets including a couple 220 volt ones. If you think you have enough outlets now, add a few more. I would use steel or PVC pipe for the air lines. Steel would be better in my opinion. Copper is very expensive right now. Plywood is a good idea. Use at least 1/2". Personally I would use 3/4". It's a lot stronger and won't warp between the studs. The plywood will stand up to abuse a lot better that drywall. Insulate the walls and ceiling before installing the plywood or drywall. How high is your ceiling? What tpye of garage door are you using? I like the coiling overhead type doors. They cost a little more but you don't lose the overhead space when the door is open.
James