If you have never skied before, why have you decided to try Canada/USA rather than somewhere closer (assuming you're in the UK) such as France, Austria or Italy? Not only will transport take longer and be far more expensive, but you'll be jet-lagged for the first couple of days, making the whole experience even more exhausting than it usually is.
If you instead go to France, Austria or Italy and use a ski travel company (Crystal, Inghams, Nielsen, Heidi and many others) the travel will be much shorter and you'll have everything organised for you such as travel, transfers, accommodation, ski hire, ski school, lift tickets etc. and you can concentrate on having fun on the slopes and at the apres ski. Wherever you go, ski lessons will be in English - just in case that was a reason why you've looked at Canada/USA.
It is not generally possible to hire ski clothing in resort - you'll need to buy in advance. Decathlon, Mountain Warehouse, Trespass, Dare2Be have perfectly good skiwear for reasonable prices. If you have money to burn, there are plenty of brands (Spyder, Schoffel, Kjus etc.) that make excellent, very expensive specialist gear that is totally over the top for a group of beginners. Go to a shop like Ellis Brigham and you can see the full range.