To really ride it, it needs a full service:
drain and refill with fresh fuel, change oil, gear oil, change coolant, tires might have aged out and need new tires. Belt might have aged out and need new belt.
But if you are going to sell it... change the fuel, check the oil/coolant/etc. check tire pressures, put in battery and crank it up. I would bet it starts first time and is rideable... if it was rideable when you shut it down.
edit: Id check that air filter to. Sometimes crawl up in there when it sits too long.