I've got 3 Sony Changers, don't know what to do

My equipment consists of three Sony Changers: two 90ES changers, and one 70ES running as a "slave" to one of the 90s. I have a MSB digital director with the scan output which permits me to use the digital output of each. They go into a Proceed PAV/PDSD.

I'm anxious to learn about using the Nirvis system, but I am literally at the moron level in terms of indoctrination. I assume I'll need a separate PC with internet access. I assume that PC somehow gets connected to the three changers. Hopefully, it also involves downloading cover art for a GUI with the on-screeen display ability of the 90ES pieces.

Am I right? If so, can someone point me to a step-by-step acquisition of materials I'll need, and then on to the process?

Thanks,