We really should know a little more about your intended uses for this system, but assuming you want to do relatively simple (or even not so simple!) motion, you'll need a few components...
A motion controller, such as the PCI-7342, can take your VB commands and turn them into the commands needed to "run" the motor. Next you'll need a drive, such as the MID-7342. This includes the servo amplifier that actually powers the motor. It also has connections to "pass through" the encoder signals from the motor back to the motion controller.
The above-named pieces assume one or two axes of motion. You'll also need a cable to connect the two (can't remember the model right now). You can use MAX to configure the motion controller, and there are just a few VB calls you
'll need to make using NI-Motion functions to define the motion and get it going.
Hope this helps!