A set-up shot for the simple white background with shadow.

 

I have two Profoto Compact 600's with their heads together to minimize double shadowing. They're both bare bulb. I could focus the light more with refIectors, but with it bouncing all over the room, I think it helps to soften the edges a bit on my subject. I used two strobes in this case at full blast to get as much light as I could. You can still do it with one light, but you'll lose a stop. This was getting me to f/8 ISO 100 at this distance.

 

I also made a point of having as little sweep on the paper as possible so that I could get my subject as close to the back as she could get. If she came forward, I'd lose the intensity of her shadow and it would elongate across the sweep. I would start changing the exposure on her as well, depending on how far back my light is. Not really a problem with this set-up, but in a smaller room, it might need to be in closer.