Sep 22, 2010 - 5:09 AM
You can find more information about the Swiss Flexi Pass here
. I think the information will cover your questions 1 and 4 as well. You can order the Pass online, but you can also purchase one in Switzerland. I don't think they are available in hotels.
Seat reservations for Zürich-Luzern or Zürich-Interlaken will not be necessary.
Ten minutes will be enough to change trains, the train connections in Switzerland are really very well organized. As soon as you arrive at a (larger) station, you will hear announcements about which platform to which train! And you can always ask the train personnel, for instance when they come to check your ticket (which they always do ;-)).
Swiss Francs can be bought a any Banking office, and the airport will certainly have possibilities too.
I hope this helps, and if not: please get back to this forum!
I wish you a very pleasant trip!