Hello, I am trading my 1991 Mazda Miata 75k miles, for any year gen 2 Celica Supra. The Mazda in question has been in AZ the majority of its life and is rust free. It is a red soft top with 9/10 paint due to minor scratches. The soft top has no rips and seals well. Car is completely stock too...

Here's a few pictures of my rust problem. I could see the rust on the quarter panel for a while now and it finally busted through. Left Quarter Panel Left side window Left side window Left side light Right side hatch What should be my approach to stopping and repairing this?? I'm scared...