Hi there,
Are there lockers or a baggage hold at the station? I want to stop in Rotterdam for a few hours on my way to Bruges from Amsterdam so I will have my luggage with me. Thanks!

I was there last year and there were lockers, but they did not take coins: payment was by a chipknip card which is a Dutch pre-payment card.
Thus, the lockers were not very convenient for travellers arriving in Rotterdam from other countries. There are outlets where you can buy a chipknip card.