My lawnmower is smoking need help......?

Well my lawnmower is about 2 months old. It was cutting the front lawn just fine until i started in the backyard. Side of the motor started smoking. I saw it ran out of oil, so i put more. Then bottom part started leaking so im uming i overflowed it. Now the motor is sputtering and weak with alot of smoke coming out. Any suggestions ? Is it damaged? Do i just let it cool off? Anything will help thank you!