Winterizing and storing it inside..."What needs to be done to the engine?"

I'm storing my boat inside the garage this weekend and have a Mercruiser V-Drive. During my last lake run I put in stabilizer when it was at about a 1/4 of a tank full and let it run through the engine. So what's next? Do I need to run antifreeze through it? Do I need to use De-fogger? The boat won't be at freezing temps in the garage.