For schedules you can check on the public transportation website (train/bus/metro/tram):
You will find that it advises you to take a train to Utrecht Centraal, then a bus to Montfoort.
The option via Woerden looks to be a much longer travel time, according to above website.
Just note that there are 5 train stations in Amsterdam, so it may be handy to figure out the nearest one to you. I can do that for you if you give your accommodation address.
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