south west weather can be brutal on a car. I see you said the car was parked in a garage but typically the dry hot weather down there will perish all of your rubber moldings. But if you are going to do a frame-off restoration, I suspect this will be addressed during any body work.
your approach is sound; verify all major systems (fuel, ignition, braking, suspension, etc.), replace all fluids and review and possibly rebuild all drivetrain components as they may have rusted or seized during that time if the engine and trans were never turned over. I would plan and budget for the worst - that is a 100% rebuild and then ease back on that where you can.