Go at the frame with the wire wheel. This is the most critical of the vehicle for safety.
As for the body, you'll have to remove the inner cardboard panels to get at the rear wheelwells. They do tend to rust at all the seams of the body. Don't forget under the rear carpet area. The gas tank tube area is another good spot. Exhaust could be a problem with coming back in. For the hood, let it go. Don't worry about it. Once you start to use it, it will break in for you. The rust is due to sitting.
Its a fun vehicle to have. Just make sure you know your passenger very wheel. Your shoulders/elbows will rub.