Have a garage sale Laura. Take out anything you care about or is of obvious value then open the door and put up a sign that says "make an offer". No pain of organizing and pricing everything and people would just try to haggle you down on every item anyway.
You can't really insulate the inside of the garage door panels very well since it is on a track. Each piece would have to be beveled so the door can still roll up. The non permanent wall sounds like a better option though I'm not sure how you could build it so the door can still operate. I guess it could work if the wall is no higher than the bottom of the track. IF you intend for the door to NOT operate at all, it could be built with notches to go around the track; take the opener and it's track out totally and store it somewhere.
You can't really insulate the inside of the garage door panels very well since it is on a track. Each piece would have to be beveled so the door can still roll up. The non permanent wall sounds like a better option though I'm not sure how you could build it so the door can still operate. I guess it could work if the wall is no higher than the bottom of the track. IF you intend for the door to NOT operate at all, it could be built with notches to go around the track; take the opener and it's track out totally and store it somewhere.