Seriously, what is difficult on bahn.de?
Go here:
http://reiseauskunft.bahn.de/bin/query.exe/en
Insert your origin, destination and the date and time you want to travel, click "search"
It then requests you to select, which Amsterdam station want to depart from as there are several, but it defaults to the central station. Click search again.
And there are your results. Telling you the "savings fare" of 34 Euro for the first two trains. If you want to depart later, click on "later" and you'll get more options.
Only difficulty I see for someone from the US is that the date is shown the European (proper
) way (DD.MM.YY). But you should get used to that anyway before going to Europe.