Well if you go to Lake Louise then you can have lessons off me
But if its your first time ever then I'd probably recommend Mt Norquay out of the three resorts as its the cheapest one for lift tickets and lessons, as your not gonna be using the whole hill like you would be at Lake Louise or Sunshine.
Lake Louise is 60km away from Banff so you gotta have an early morning. Sunshine is about 26km if I remember correctly, not bad for travel, great resort but if its your first time you won't make use of it.
So yeah I would recommend Norquay, it;ll be cheaper to learn and I would imagine not as busy.