You will get as many answers to this as there are people responding (o;.
I fill the tank so it won't rust... Put in one oz. of star tron gas treatment... Then shut of the petcock and run it until it empties the carb... Leave the valve closed during storage..If you like take the plug out and squirt some oil in the cylinder....Make sure the bike is washed good and waxed... Tri-flow all exposed metals. Some guys lower the tire pressure... Cover with a breathable material..
As far as the tools etc. for trips.. Well. Tire irons,some guys use slime. Extra tube if you are really going someplace hostile... "GPS" Have fun.. OMM.