Stay on the edges.

seriously the fastest way to fall is to let the board go flat.

Practice on the bunny slope for a little bit making heel side and toe side turns and don't be afraid to turn the board using a combination of body weight and edge useage.

If I lived down there I would go up with you and give you an hour of instruction and you would be up and enjoying it after that. I used to teach for 3 seasons in Montana and only once did I have anyone not get the hang of it after one lesson.