New to me 65 Dart Gt, what to look for

Hey guys,
I just purchased a 65 Dart GT, slant 6 AT PS PB. It is in good shape boy wise other than 2 small rust spots behind the rear tires. Interior is original and in good shape.
What I need is what to address first AKA most common problems or short falls with the early A body.
Also sources for parts.
Thanks