From Freiburg, Germany and plan to travel to Amsterdam, Paris and on the same second day(off to Zurich to fly back). Can anyone suggest to me the plan and which trains, and how many hours to travel for this two destination for only two days.
I'm finding your post a little unclear.
What is 'The same second day'?
Check the Deutsche Bahn web (bahn.de/i/view/GBR/en/index.shtml) for prices and timetables but you may spend half of those two days sitting on a train (and you will have to sleep) so I don't think that will have the chance to see much of Amsterdam and Paris.
Are you sure you don't prefer to see, let's say, Strasbourg, Munich or Basel?