A bit of an outdated times and fares linked there.

On Nikko, there are a multitude of different services to Nikko including all reserved seating trains and non reserved seating trains (similar to the different Keisei Line services from Narita Airport). You can get to Nikko from Asakusa or by all reserved seating trains in joint cooperation with JR from Shinjuku.

Timetables to Nikko plus various passes if you to to Nikko from the Tobu Website:
http://www.tobuland.com/foreign/english/nikko.html