Dude, you're building my dream!
Figure out how many outlets you need, then double it! You can't have too many.
Put in more than the standard number of studs. Or better yet, pick a couple of heights and put in a horizontal rail of 2X6's. There never seem to be enough studs to hang heavy stuff.
If you have overhead shelves with open floor below them, put the bottom of the shelf 2 inches above your height. That way, you can always walk under them. I'm 6' 1" and my shelves are 6' 3".
Do you need to hang anything from overhead? Such as a camper top? If so, put in some additional cross members to attach to. I back my truck into my garage, slide 2X4's under the camper, and hoist it up. To 6' 3" of course!