Well first of all if all you have is an empty pair of Xenon headlights then sorry to say you still have an expensive way to go
First you will need your Xenon bulbs, ballasts and ignitors 2 of each
one pair of indicator bulbs
one pair of H7 main beam bulbs
one pair of wedge sidelight bulbs
This is to get the headlight working which will see you around £1000 from volkswagen new.
You will also need a pair of kufatec 10 to 12 pin adapters these can be bought from either kufatec website or ebay.
To allow the high beam shutter to work if you search for my post you can see how to get this working.
The auto leveling i have not done yet but i am sure you can get this from kufatec for around £300 im sure but may b wrong that is for the wiring loom. Their is 2 sensors front and rear on the suspension not sure about a price for them but its an expensive route
Hope this is at least some help