Firstly due to arrive at Haneda airport on the 30th april at 21:30 (JP time) and planning on staying a night in Tokyo, then on the 1st of May getting a train to Hakodate in southern Hokkaido.
Does this shinkansen require a seat reservation to be made? Also am I able to collect my pass with an exchange order and then validate it and use it on the same day? If not just means I would have to stay an extra night in Tokyo first as even arriving at Haneda at 9:30pm is too late to collect a railpass, let alone the time after collecting baggage/passing customs etc.
Thanks in advance for any answers, Matt. :)

