there is a tap at the bottom near side edge of the radiator. no tools needed to drain it. This is the only drain point needed, may be some small spillage when you take off the coolant pipe.
Dealers will often say you need 4 litres, however if you drain it properly (so thats including heater matrix etc then you need 5 litres).
So when draining / refilling make sure the temp in the car is on warm so that the heater matrix is open.
Use pink stuff as its a 5 year change and make sure you get coolant thats comliant with VW specs. (ie g12. its not that expensive from a dealer).
It a self bleeding system, there are no bleeding points on top of the radiator to worry about.
As above, check the level after initial running and top up as required.