This is what you need:
http://www.bhphotovideo.com/bnh/cont...ughType=search
The transmitter goes on you camera just like an external flash, the receiver plugs into the back of your alien bees.
You'll set the camera in manual mode at 1/125. Your fstop, well that will depend on a lot of things, of course. A light meter can tell you what to set it on, or you can shoot a sample pic, look at the back of the camera and see how it looks, repeat until you get what you want, etc etc.
The cheaper route, of course, would be to simply purchase a sync cord:
(Several listed here:
http://www.alienbees.com/hardware.html ).
But then you'll be limited to the length of the cord. And being attached to a light sucks. The infrared transmitter/receiver is the best way to go.
Using your flash to trigger the strobes will always always always result in inconsistent results.