You need the seats obviously, the loom and the climate panel.
No coding is needed to get them to work but you will have a fault in VCDS unless you code the CECM.
You need to buy a loom to match the age of your SEATS not your car.
If your using post 2006 seats then the job becomes a real pain, the looms Kufatec supply for these seats is designed for a left hand drive car and needs a lot of cutting and extending to get it to fit.They are aware of this problem but I'm not sure if they have addressed it yet ( probably not ).
Pre 2006 the loom is still for a left hand drive car but the connector to each seat is the same so it can be used easily in a right hand drive car.
Do a search, its been covered recently in detail.
Lee.