Do not drain the gas, Put in Sea Foam in a Full tank and run the bike to get it in the carbs.
Draining the tank allows for condensation in the tank and starts rust.
Good Idea to remove the batt if the bike is stored in a unheated location, Put somewhere room temp and put a Float charger on it.
Tune up really doesnt matter now or after.
Chad Falstad "Hawk"
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"