Insulating a Finished Attached Garage

[superman22x]

I recently moved into my first house, and the garage needs some updates. I plan to install a heater for the winter, and with that, I plan to insulate the garage. The walls already have drywall hung, so I'm looking into simple options with that in mind. The house was built in 1965, so I am making the assumption that there is no vapor barrier in the walls.
One option was to drill a hole between each of the studs and blow in insulation, and use vapor retardant paint on the walls. Is this appropriate for a Michigan climate? The answer to this may decide how I do the next step...
I need to add wiring to the garage. My plan was to run conduit on the walls, I like this option since it's easy to modify in the future. However, if I was re-hanging drywall, I would run wiring in the studs.

Thanks!

 

[The Cobbler]

vapour barrier in garages is questionable at best. some say you need, others say no, others say makes no difference, I'm of the camp that it doesn't hurt but not necessary. a couple of good coats of oil based paint will be effective as a vapour retarder .
I istalled vapour barrier in my garage, but I had it, and it was a way to keep the insulation intact while I was working without wall coverings .

 

[superman22x]

Ok, sounds good. I might go about doing it by drilling the hole and blowing in insulation then.

My wiring would be done with 3/4" conduit, I want to run 2 120V circuits, and one 240v circuit. It seems all this will fit in a 3/4" conduit with a little room to spare.