You need :
dual lnb (2 0utputs) or quad (4 o/p)lnb or if you want octal (8 o/p)lnb
the lnb is the bit in front of the dish face.
wire back to new receiver (sat cable is twin sceened)
You only need to speak toSky if you want Sky programs.They will supply a Mirror card which replicates your main card and will cost approx �10-�15 / month.
If you just want BBC 1,2,3,4 Itv channels , sky news and about 50 + freebies including movies CNN, music,but NOT ch4 or 5
you can just watch away.
You ONLYneed a Freesat card for ch 4 and 5 @�20 one off payment