I would dump the gas, replace the battery, check the air box and general wiring for rodent nests or chewed wires. Also check the tire pressure and for dry rot cracks. If its been stored inside in a dry place I'd just check the oil level and condition if it looks good run it for to 500 miles then change it. This thread needs pictures. Good luck.
99 Kawasaki Vulcan 800 (sold)
2012 Vegas (traded)
2013 Cross Country Tour
Victory Tri-Ovals, Reverse Kit, Lloydz air filter, Lloydz quarter turn throttle ring, PCV, Lloydz Touring cams, HMD Bars, DGD keyless ignition, Rockford Fosgate Amp, klockworks windshield. 119hp 123lbs torque.