If it had fuel mix in it all that time, plan on cleaning the tank, and replacing the fuel line and filter. The carburetor will need to be disassembled, cleaned and probably re-kitted. Clean the muffler and replace the air cleaner if clogged or disintegrated. Check for spark when the plug is removed. If everything looks good, start the engine and check for chain oiling by running at speed for a few moments with the bar tip near some cardboard--it should throw off a thin line of oil onto the cardboard. Hope this helps!