JD X495 smoking help

Hi, I have a JD X496. I left the key in and the battery died. We tried to boost it off but I did not attach the positive terminal to the JD battery good enough. It fell over and shorted out the battery. The electronics started smoking and white smoke clouds Came off. I bought a new battery and attached it. Then the alternator started smoking. The lights on the dash still will not turn on. I need help I don’t even know where to start. Any advice would be much appreciated!!!