Icebike rocks. I learned a neat trick there last year about leaning your body in a turn to keep the bike upright and maximize traction.
Clothing you'll probably learn by trial and error. It will almost certinly require lighter clothes than you think. The many trick is keeping the small bits (fingers, ears, nose, etc.) warm while not roasting the torso.
As for equipment, definitely rack and fenders. Don't forget lights.