Below you can find some information that can be useful when you come to the Netherlands as an international student.
The OV card can be purchased at every terminal at every train station in the Netherlands. However, if you want a subscription, you will need a personalised one, which can be ordered here: https://www.ov-chipkaart.nl/ov-chip-kopen/persoonlijke-ov-chipkaart-aanvragen.htm
For cheaper train fares you can buy the dal-uren subscription which will give you 40% discount during the weekends and off peak hours, which you can buy here: https://www.ns.nl/en/season-tickets/dal-voordeel.html. Be aware this is for a year, you can purchase a monthly subscription using the NS flex. This provides the added benefit of paying directly, so you never have to put money on the OV card as it is directly withdrawn from your bank account monthly.
For student housing you are recommended to register with SSH, this is the organization which provides the most accomodations in Uttecht. You can find more information on their website here: https://www.sshxl.nl/en. For exchanges of 6 months and shorter, the SSH has reserved rooms for international students called short stay.
Other than that, Facebook is recommended. There are several pages for finding a place to live. Try things like: Rooms Utrecht, Kamer zoeken Utrecht, Kamers Utrecht. You can respond to the rooms that are available and you might get invited to see the place.
And another website you can use: https://housinganywhere.com.