train ticket from Amsterdam to Antwerp
 

I'll be going to Amsterdam in early June.
I plan to take train to Antwerp as soon as I arrive in Amsterdam at around 9:30 am. Do I need to purchase ticket in advance or can I just get it there?

After that, I plan to take train three more times: (1) from Antwerp to Brugge, (2) from Brugge to Brussels, then (3) Brussels back to Amsterdam. I am assuming I can purchase all these after I get there...but am I wrong?

I think I just started the panic mode.

Thank you for any assistance.

Intercity trains run every hour from Amsterdam Centraal via Schiphol to Antwerpen Berchem (where you can change for Antwerpen Centraal) and Brussels. These trains have no seat reservations so there is no need to buy a ticket in advance. You just buy a ticket at the station and get on any train.
Trains within Belgium similarly have no seat reservations and no need to buy tickets in advance.

Panic? Catch a train from Schiphol airport. It's about as complicated as jumping on a bus, but buy your ticket first. You can't buy a ticket on the train. There is a big ticket office in the center of the airport.

In addition to the International Express trains you can waste money and take the Thalys.

Tickets to Antwerp are even available in the vending machines at each station. They accept coins, Maestro and pin passes.

You can practice with these machines in this demonstration:
http://webdemo.ns.nl/e2000.html

-First, click on the "English" button
-Click on "To Belgium/Luxemburg/France"
-Follow instructions

thanks. i can relax again...until my next panic in the middle of the night. :)