Re: Finishing garage ceiling 2 part question
I concur with most of what Ed suggests, except the sheetrock - sort of.
Code requires a fire rating between the garage and attached living space, which is met by the 5/8 rock. Also, 5/8 rock is more resistant to sagging than even reinforce 1/2" rock is, so I'd recommend sticking with 5/8 on the ceiling. Using it on the house facing wall would not be a bad idea either, though with the space between the house and garage it's not a necessity. All other walls can be 1/2", no problem. If you're going to be hard on the walls, then I'd suggest sticking with 5/8 throughout. Definitely use screws to hang the rock, it will prevent nail pops in the future and gives a much stronger hold than nails. A few nails to tack a sheet into place is perfectly acceptable.
I'd also recommend either running the wiring before the drywall to save the time and expense of all that conduit OR run the conduit in the walls before installing the drywall for a much cleaner look and feel. With the conduit in the wall you can still change your wiring as requirements dictate. You can also run additional conduit on the surface if necessary, but it would be minimized. Again, this is more for aesthetics than anything else.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!