Well let's just hope that if there is something big broken you didn't make it worse by trying to pull start it.
Take the crank nut cover off and throw a socket on there. Pull the spark plug. Slowly rotate the engine over. If it gets hung up it's time to break her down.
Take the crank nut cover off and throw a socket on there. Pull the spark plug. Slowly rotate the engine over. If it gets hung up it's time to break her down.