Plastic bags on the exhaust is not a good idea traps moisture
Steel wool in the exhaust ends to keep out critters if you are worried
Sea foam check
Breathable cover no blankets or anything that can't breath I use a bed sheet.
Spray the entire bike metal parts especially with wd40. Have been doing this for years for our long winters and have had excellent results no rust on any of the bike I have stored this way when you get back to ride a good wash put the battery back in and enjoy
I also like to change the oil before putting a bike away clean oil not combustion related acid build up