I did very little to it before hanging it, just a some cleaning up. I used a wire brush and vacuumed it. I also rinsed it off with a 10% bleach solution. Last, a light coat of mat spray polyurethane finished it off.
We used a French cleat to attach it to the wall as it was rather heavy - just a 1x8 ripped down the middle at a 45 degree angle. The top half attached to the door itself and the bottom half attached to the wall. We also attached a piece of 1x4 to the bottom back of the door so the door would not hang in at an angle.