Keep reading this forum, all the old threads and you'll get an idea.

My best tips:
Latex gloves as the base layer on the hands. Add to it to make it work (for me in -20degg = latex + wool gloves + mechanics gloves).
Bread bags as the base layer on the feet. Add to it to make it work (for me in -20deg = bread bag over toes and balls of feet + long wool socks + long johns over socks to balls of feet + long wool socks over the long johns + bread bag over the entire foot).
Ski goggles over balaclava, under helmet, under popped jacket collar. The only thing with one layer is your mouth and nose which due to breathing will be OK.