Sculling draw strokes are just another way to smoothly pull yourself across the water sideways.  The sculling draw stroke shares a great deal of similarity to the sweeping motion of a sweep roll except you are upright and the paddle shaft is higher of course.  As with all draws, you need to turn your torso sideways facing where you are going.  You move the paddle blade from front to back in a gentle arc and keep repeat vice versa.  A great way to start practicing the roll is leaning the boat on its edge and perform the sculling draw.  Here is a good demonstration of this stroke: Sculling Draw Stroke.

Bracing is a whole topic in itself, check out the following article for a more in depth discussion on this critical topic: Bracing.