Too much to list. Start with PCPro, programming, IP phone list, check an extension number. Verify VoIP DB installed. You mention CCS? Is that IP CCIS? If so you have a VoIP DB. CMD 15-05. Are these on site or off site phones. Will they be plug-n-play, automatic or manual registrations? DHCP or static IP addresses on the phones?
I'll look for a .pdf that may help you.