If you are only storing over the winter, put the battery on a Battery Tender and treat the FULL tank of fuel with Seafoam/Stabil. I prefer Seafoam myself. Make sure you fill the tank so there's less airspace for condensation to form as water means rust and contaminated fuel. Neither of which are good. If carb'd, then run it long enough to get treated fuel into carb.
If it's an unheated garage, you could take the battery out and take it in the warm house, and put it on the Tender there. Jack bike up off suspension if you have that option. Sitting on carpeting is another idea, or on a rubber mat, to be use as a moisture barrier. Plastic on the cement floor with carpeting over it is the cheapest.
I always tell people to wash and wax their bike before storing. Especially a good coat of wax on the chrome.
Cover with soft sheets or blankets or a motorcycle cover with a soft under-lining. A small, low running fan isn't a bad idea either, in some garages, due to moisture build-up on cool metal with block walled garages, when it gets warmer out, but it was a cold night.
Lastly: Change oil and filter before storing and DO NOT restart, contaminating new oil with acidic combustion byproducts. Resist the temptation. Tape a large note on the tank to restart bike in spring, then recheck and top-off oil if needed.
No need to add oil to cylinders if only storing for winter. For a year or longer....I'd fog the cylinders with a good lubricant, or synthetic oil.
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