I'm a sculler. I have a couple sculling floats (the generally accepted term for your boat).
In the above posted video, the best view of the oar blade movement is at about 4:30. But, of course, that guy is facing the wrong direction, and he's not on his back. A better look at a somebody sculling on waterfowl can be found here:http://www.youtube.com/watch?v=kClowyhlzGA
It's difficult to explain how to do it, but I will give it a go. Start with the blade of the oar horizontal and directly behind the float. If you've ridden a motorcycle, I like to say twist the oar like a throttle as you push across your chest. At the end of the stroke, let the blade flatten out again to cut through the water with no resistance as you begin to pull back across your chest. Then twist the oar in the opposite direction on the pull for your power. Let the blade flatten again as you star your push. Repeat many thousands of times.
The only variable is whether your oar is made to be flat-side up or flat-side down. On a flat-side down oar, the resistance and power comes with downward pressure as you are pushing and pulling. On a flat-side up, it's upward pressure. The hunter in the video I linked to looks like he has a flat-side up, judging by the figure 8 motion of his hand. With FSD, the figure 8 goes one way, and goes the other way with FSU.
Keep all movement below the gunnels. Keep your blade under the surface of the water. The hardest part when beginning is avoiding any rocking motion of the boat. Ripples give you away for sure. Good luck and practice, practice, practice.