I shouldn't but I'll guess the oil capacity of the 1.4TSI as being 5 litres, that guess will not be far out, certainly more than 4 litres I'd think.
Coolant, I'd always replace the coolant if replacing a water pump, only use VW Group concentrate to be safe, probably no more expensive than buying similar but with a different branding. Cooling capacity seems to be almost a trade secret so maybe buy 3 litres and see how it goes using it as 50/50.
Hopefully someone will turn up with a better idea, so far in my VW Group ownership life of 20 years, I've left cambelt changing to VW Group
dealership or Indies and the bills don't seem to list coolant conc being charged for.