i hope i am helping here, and not adding confusion:
there are two a/v outs on the 64:
1) the DIN one right in the middle of the serial DIN port and the little RF port
You would use this port if you had a cable with the correct male DIN end and the other end would probably split apart into 3 or 4 separate RCA plugs.
This sounds like you do not have this cable
2) the little RF port
You would use this if you were to hook up directly to your TV, connecting the cable to the cable in or VHF connections on the back of your TV.
It sounds like you have this type of cable.
So, you connect one end to the little RF port and then the other end to a connector that can connect to the TV.
Most people I know use those 'game/tv' swiitch boxes, and they have an input for the cable and one for the game device, in this case the 64.
IIt will have a switch to go back from cable to game, and also have either just an output connector that ends in two metal ends, which get screwed to the back of the TV on the VHF ports, or it will also have another output connector, this time to connect a coaxial cable to the coaxial connector to the back of the TV.
Then you turn on your TV to channel 3 or 4 i think,. and then on with your 64 and hope for the best.
you can also connect your 64 to a vcr and then to your tv as well, etc...
there is also a sweet connector you can get, which is very small, and connects between the cable from the RF port on the 64 and then to the coaxial port of the TV, as it has one end for RCA and the other for coaxial. nice and small device.
chris