Germany is a large country, you know. Tell us which city (or region) you have in mind and somebody will be sure to help you out.

munich but i was thinking about bying a separate national pass for germany so i can go to berlin and hamburg and end back in munich for a train to amsterdam

So you want to travel Prague to Berlin to Hamburg to Munich to Amsterdam?
 
I’d suggest something like Prague to Munich to Berlin to Hamburg to Amsterdam, or Prague to Berlin to Munich to Hamburg to Amsterdam.
 
Or do you have to return from Munich to Amsterdam?

actually im thinkin about doing budget flights from ams to prague then prague to munich then munich to ams to fly home i think it would be cheaper what do you think?

You can fly from Western Germany( Koln/Dortmund/Dusseldorf) to Prague for around $30 each way.  Then a train from those cities to Amsterdam might be a good option, its only about a 2 hour drive. But if you want to visit Munich then do it on the way to or from prague for sure, if not you will be back-tracking

i have to back track any way bc my flight back to america leaves from ams