How should I go about fire proofing my garage?
For the Access to the Crawlspace and Attic you can use a Fire Rated Access Hatch. We used one in our Garage. I can't seem to find the Make/Model, though its something like this. They come in all sizes. 

You also want to have Any Wall Penetrations with Fireproofing. If you have Plumbing (water heater, Vent Stack, Electrical, etc that is not behind the sheetrock you need a fireproof barrier. They make several things to do this