Here's a link that will help - The Boater's Guide To Winterizing - Seaworthy - BoatUS
There's tons more if you "google".
Mine was shrink wrapped yesterday ready for winter. Just before the workers started on her -
- I removed all the canvas for annual cleaning and Sunbrella / 303 treatment.
- I then made sure that all my salon benches / cushions etc were put on end so they get air circulation over the winter
- Then I opened a box of Bounce (or whatever is on sale) dryer sheets and spread them all 'round the salon, galley, head, and sleeping cabin. These sheets can also be used in the cockpit area. They are a pest preventative as well as keeping your interior smelling nice. Next spring it will smell like a Barkerville whorehouse (if you're from British Columbia you are chuckling eh?)
- Use the damp rid tubs (at least 4 or 5 of them) placed in different areas down below. Walmart has an excellent unit that holds a huge amount of calcium chloride and has a good size water reservoir. Any RV store also has them.
- I have been advised to never leave any port lights open over the winter storage months. I also leave the cabin door unlocked so in the event of a break-in, there is no damage to the door or locking system.
Hope this might help - sounds like you're on the right track!