I would second everything that Kent said. I forgot to mention plugging every hole with plastic or cloth, including the holes in the hull. Peakes will also tell you to buy a tub of cheap grease and liberally smear a ring round every part of the cradle and chain leading to the boat - to stop ants and other nasties crawling up and finding a new home!
We had a new Genoa made at Ullmans and he checked the other sails too. If you were having yours cleaned or any stitching re-done you can take your sails off while you're afloat in the marina and leave them there for the off season. It's only a 300m motor across to Peakes.
Ocean Hobo SN96