Assuming that your car is Bluetooth equipped, that does all you need. My Samsung S1 mates easily with the Golf Mk 7, for phone calls and music.
On cables, I believe that there is no cable for the latest iphone, you have to add the £25 apple converter.
Other will know more than me, but I think VW' standard cables are the old apple connection, or the regular 3.5 generic connector.