Is there a train that will take me from Oranienburg Germany to Amsterdam?
That requires changing trains at least once in Berlin, since you are in the Greater Berlin area . You take the regional train Oranienburg to Berlin Hbf, then change to an IC train direct to Amsterdam.
https://www.bahn.com/en/view/index.shtml
from: Oranienburg
to: Amsterdam Centraal
Prices start at 39.90 euros.