Yes, I think you can use Zaino with a PC, however I personally don't think there is any benefit from doing so. It was originally developed to be used by hand and I feel this is the easiest and fastest way.
No, don't buy Z1 if you're going to buy ZFX. ZFX is a substitute for Z1 so both are not needed. A good starter kit would be ZFX, Z2, Z5, Z6, and Z7. Clay is optional but I highly recommend it. I've had wonderful results with Z18 clay. Read the directions and tips on the Zaino site several times if necessary. All the info you need to get started is there.
:xyxthumbs