you have some work ahead of you. I had a similar issue. as long as the rust is just surface rust and has not eaten a hole in the frame you'll be ok for the time being. Go pick up some wire brush attachements for a drill, remove what you can from around the frame, and go at it. Do it in segments. Get some rust o leum rust sealer, spray that then spray black rustoleum paint. Make sure you cover as much as you can to stop the frame from being eaten up. Its not hopeless. A shop down in FL quoted me 2k to remove the body and clean the rust up. Biggest thing is to make sure the frame, or body mounts, are not rusted through.