By the looks of the brake pads, the grooves ins the rotors came from a set of pads that were on the car before that set.
Just put a new set of rotors and pads on the front and you should be good to go.
You may have to replace the calipers if you cannot get the piston to compress enough to install the new pads.
Down load a copy of the factory service manual, search for it on this site, it will walk you thru it step by step.
