I sell them at work, i would say a carb rebuild kit, extra oil, spark plugs, air filters and fuel line.... The Ethanol in our fuel eats carbs and fuel lines if left stagnant for 30 days or more.
I definitely suggest that if you aren't going to use it for more than 30 days that you dump out the fuel then start it and run it until it is dry. The ethanol will start to eat away at the carb once it sits in there for 30 days or more..