I'd mix up some gasoline with the proper dosage of fuel stabilizer added, fill the tank with it, run the engine for a few minutes, stop engine, remove battery and keep it on an automatic battery charger, cover the muffler outlet.
You can do more (like actually ride the bike until it reaches full temperature and change the oil and oil filter, lube control cables and the drive chain, wash it squeaky clean), but I don't know if your back allows for any riding or crawling around on the floor.
When you put the bike back into service, I'd drain the old gas out of the tank and put it in the lawnmower and service the air filter (rodents love to move in and live in your airbox when the bike sits for long periods).
Also check tire pressure.