Our organization currently has a single domain with 4 DC's running Server 2008 R2. We have 2 distinct entities within the organization and are exploring the possibility of splitting off one of those entities onto its own domain. We also use Google Apps for mail, calendar, etc. We would still need a trust between the 2 domains as there are some resources that we share, but not many at all.
It seems a little overwhelming to me given there are so many aspects to an AD environment (GP, DNS, User structure, Groups, etc.). I'm am by no means an AD expert and am trying to get a handle on the work involved here. My initial thought is to hire a consultant to assist.
Is there any sort of documentation out there on best practices and/or a checklist to help better get an idea of what is involved?