The storage climate one vital part.
My garage is dry and warm. It is part of the house. Door from utility room.
I do nothing except charging battery until charger show green.
A day or over night. Once every month or 2 months, even in riding season. Plus after carb sync or other battery draining jobs.
Fuel as left.
I usually start my now 2 bikes mid winter. More for me than let "new" fuel fill the carbs.
If I should live in a very humid place with changing temperatures, I should take in battery in house/appartment and store bike in a sealed tent that other guys here have showed.
Sacks of drying agents inside too. Or another air drying device.
I stored my K6 in a barn during 19 years. Except for rust inside tank, rusty valve seats. No ethanol in fuel then.
Fuel stabilizer if fuel contain ethanol.
I have a bottle I have not used yet.
Bought it cheap at my nearby dyno shop for test.
Today low ethanol fuel if any, Shell V-Power.
I should never use E10 fuel in anything.
Maybe OK in a Molotov coctail.