• https://www.ns.nl/en Amsterdam - The Hague
• https://www.nsinternational.com/en/belgium/train-brussels Amsterdam - Brussels
• https://www.belgiantrain.be/en Brussels - Ghent
• https://www.thalys.com/fr/en Brussels - Paris

Everything is available online I mean… use bahn.de or those links for planning and then those websites to buy tickets

Thank you. I got a little overwhelmed with all the info I was reading online. I was also wondering if it will be wise to get one pass for the whole trip or book regular train ticket 

Is that your whole trip ?

If that’s your entire trip buy regular tickets 100%. Thalys trains have a 27€ seat reservation on top of the pass and it can easily be sold out a few weeks in advance. Not worth the hassle (and you won’t save money).

Book Brussels - Paris well in advance if you want cheap fares. All other ones can wait and cannot sell out

Amsterdam-Brussels has cheaper fares on the intercity trains if you book at least 1 week in advance.

Yeah. Basically, it’s like this 
 

• Amsterdam to the Hague and then back to Amsterdam
• Amsterdam to Efteling Park 
• Efteling Park to Brussels 
• Brussels to Ghent and back to Brussels 
• Brussels to Paris (while in Paris, trips to Versailles, Giverny, then Disneyland) 

Yeah then a pass won’t be worth it for sure

• Amsterdam - The Hague 2 direct trains per hour (52 min)

Here is some info about Efteling : https://www.efteling.com/en/contact-route/public-transport

• Amsterdam - s’-Hertogenbosch 4 direct trains per hour (55 min)
• bus to and from Efteling
• s’Hertogenbosch - Breda - Brussels hourly connection (2h)

• Brussels - Ghent 4 trains per hour (28 min)

• Brussels - Paris 1-2 trains per hour (1h22 at 300 km/h)

Oh my! Thank you so much for this. You saved me from wasting so much money  Thank you so much.