Couple of things to consider...
1. Fill the tank to the top (prevent condensation in the tank) With fuel Stab...
But, drain fuel when you return.
2. Remove battery good call
3. Put bike up on stands at least off the wheels..
4. Lightly coat all metal parts with WD40 or similar product! (Not gas tank)
5. Remove plugs and add 1/2 teaspoon (approx) to each cylinder and bump engine over to coat cylinders. Re-install plugs but don't restart.
6. Lightly coat chain with chain lube.
7. Lube all cables with graphite lube...
8. Also lube key slot...
9. Dry rot is your enemy, be prepared to take sometime getting the bike back on the road when you return! Funny things happen when you store anything this long. Rodents, pest, thieves, etc...
10. Cover bike, say small prayer