the gateway has USB and AUX, the USB is for power only as it has no other power source.. i plug the USB on the gateway to my ipod USB port on the car... the stereo is the standard one I think is 3.5mm its the one same one that the car uses... so straight usb -> usb stereo -> stereo and you're done..

pandora's bluetooth setting is uder options... hit bb key then hit options and you'll see enable bluetooth in there

before i bought the gateway i was just using a 3.5mm stereo male to male cable to go from the phone to the car... nothing special... the gateway is 30 bucks and its slick...