If you need rental, yes I would think you need to phone them to reserve some equipment for you and your friends. Camp Fortune is close and good for beginners. Here is the link: http://www.campfortune.com/en/ski/home.php
Go to Mont Tremblant. It's the best ski resort in eastern Canada. You can stay there for a couple of days. You need reserve your accommodation. For rental, no need for reservation.
We go there every Christmas. It is great!