Welcome to the forum.
We do have specific forums for woods and thermometers, just look farther down on the main page for more info (if the above didn't help)
The issue about the garage is "it depends" on the airflow. The smoke from the smoker has to go somewhere and you want it outside. If you let it, it WILL discolor all the stuff in your garage (paint, etc) because it will settle on everything if the air doesn't carry it outside.
Do NOT attach a vent directly to the smoker, it will affect the airflow (cut it off actually). The only way is to put a draft fan above it to draw it out. Some will put a vent tube just a couple of inches above it to give the smoke a place to go, but that doesn't work always.
You could set it up at the G. door and use a fan to blow the smoke out.
It works fine on a back porch, I'd put it there and get a cover for it.