There are two ways you can go, and with that several options for one of the ways.
1-Head unit (uh-huh, I said head unit) that is Satellite Radio or at least Sirius Ready. Just need the tuner and ant. package, and you can control it with the deck.
2-Add-on. Control unit and everything else seperate. Mount with stick ons, hardware or suction cups. Depending on kit.
To hook it up.
Wireless FM transmitter: Set the transmitter to a weak station, tune deck to the same station. Worst quality, might be okay at best. You have to mind batteries. And if you drive distances, might have to fuss with station selections to get signal.
FM Modulator: Wired transmittor. Better. Not great, but you don't have to fuss with stations when driving. Just set to one station and forget it about it. I had this before my sat. ready pioneer deck was installed.
Auxillary in: Your deck might have a 3.5mm (headphone sized) or RCA auxillary input. Plug into here for better quality then the transmitters.