If your scope can be controlled through your computer already and you a say you have ASCOM driver installed, then you should be able to just the Orion autoguider and PHD to controller via your computer.
The Orion Autoguider acts as the camera for PHD and PHD issues commands to your scope via the ASCOM interface.
PHD also accepts a number of other cameras for guiding input. Download and install, then see what cameras you have lying around that can talk to PHD
Trev
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