As above the dealer should explain re adblue on pick up if not make sure you ask about it.
The tank filler is below the fuel filler cap takes 13 litres and ours was full on collection. The display on dash gives details and warning when getting low. Ours gave a range of 4000 miles on pick up 1/2 already used (near 2000 miles done) so range appear about right for display.