If it were mine with ONLY 10 hours I would fog it, "maybe" change the gear oil (Only because it could have leaked), and put it away. Next year start it up and run it, making adjustments as needed. Spark plugs are good for hundreds of hours.
Actually we boat year around in California so I have never winterized anything for myself
Other people seem to think 70 degrees (21c) is too cold to take a boat out in January