Generally the foot placed in the front on the snowboard is determined by instinct (e.g. the first foot you move to make a slip). Nevertheless, the bi-directional method is now preferred.
One method used for first time riders is to stand in front of a friend who gives you a push: the first foot you move to mantain balance will be the foot you set up at the front of the snowboard.
Right foot forward.
Forward foot facing in the advancement direction.
A turn where the heel edge faces to the outside of the turn.
Left foot forward.
A turn where the toe edge faces to the outside of the turn.
FACKIE OR SWITCH STANCE
Rear foot facing the advancement direction.