Scott, I think that the above advice is pretty good already.
1 Light plus reflector would be the minimum, and you can surely learn to get all of the AlienBee's potential. Even if you have a regular camera flash, you can help add options as well.
2 Lights works great for me, and a canon flash for the camera helps equalize things. I also use a reflector.
There are out there 5000Gigawatts per second 32-light systems (I hope you get the idea) and many are often going to recommend you get the most lights and most expensive setup.
Truth is -at least for me- having had a 10,20,30,40D before I owned a 1D truly helped me to increase on my knowledge of digital photography. Had I bought a 1D to begin with, I would have saved money (perhaps), though the learning curve would have been way too steep to learn 100% of the camera's potential.
And so with lights, it is the same. I see nothing wrong starting small. Specially AlienBees, as you can grow and upgrade when your needs start to change, shift, or take new shape.
Best of luck.