If that is the entirety of your rail travelling then either local tickets or a Benelux pass. https://www.interrail.eu/en/interrail-passes/one-country-pass/benelux

It really depends on how much you will use it, I wouldn’t be surprised if the pass wasn’t the cheapest option for many tourists, especially bearing in mind it only covers trains and not the tram and bus networks.

Naarden-the old city proper, is only by bus. The station is Naarden-Bussum, but is In Bussum.

That pass is hardly worthwhile-the sectors are too short. You also did not clearly tell from WHERE this all should happen. You did not clearly tell if it was just for 1 time or for more trips-longer stay.

IF you are the normal tourist on a short stay of a few days: there is also ARTT: Amsterdam Region Tikcet-for 1 - 2 - 3 days, that covers this area and the places you mention. But even that might cost more as buy tickets. But it also covers all buses/trams-like to get to your HTL etc.

For trips NL-BE: buy t least 7 days advance via b-europe or via NS-international a dated ticket-then its cheaper-have to go via Breda-Antwerpen train-but there is no RES nor tied to a specific train/time.

Tickets IN BE are a lot cheaper-if bought there-for ju+senior.