help with garage insulation

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I live in North Dakota and am looking to insulate and heat my garage. It is a detached garage. I am looking for advice on how to get started after the electrical is all done, mostly on how to insulate the ceiling. How do I get started? Do I need to put some type of subfloor up in the rafters first? What type of insulation is best? Do I need to vent the attic? I would like to add a ladder to provide a little storage in the rafters. Do I need to worry about moisture? As you can see, I only know the basics of handyman work, but I really want to try and do this myself to cut down on costs. I have insulated walls and put up sheetrock, but never a ceiling. Any advice would be great to get me started. Thanks.

Hi Bigbrad123 welcome to the forum, I'm happy you joined in.

There exists the possibilty of insulating with fiberglass bats. However ventilation IS very important. Therefore a new product has been developed called ventilation baffle.

As far as I know this required more work (obviously) but not a subfloor.

fiberglass batts would be your best bet for the garage ceiling, i myself like the brand "john mansfield" from "menard's" home improvement center. if you're wanting extra storage in the attic space, put down a decking of osb on top of your ceiling joists before you put your insulation in between each joist, that way you can just push the insulation up against the bottom of the osb and it will "friction" hold in place with little or no staples while you put up your ceiling drywall. if you are going to keep this attic area as a "cold" storage area all you'll need to do is make sure you have venting for the attic (by roof vents &/or soffit vents) you could also insulate this attic area by using polystyrene baffles that you put up against the underside of roof decking keeping outside air circulation from vented soffit up to a vented roof ridge and then put insulation between the rafters and exposed walls or gable ends. the air circulation between the roof decking and the insulation will help prevent moisture. in sweden and norway they use just foil backed foam style insulating panels right against the roof deck itself and don't seem to have any problems with moisture and also helps to keep attic area cooler in summer months.