Active Directory generates Windows Events messages for each of its actions, so your first task is to track down the right event log.
This is a short article with the steps needed to start security auditing within Active Directory.
The procedures for adding a domain controller to an existing domain in Active Directory is the same, no matter which version of Microsoft Server you have.
Add Users and Computers to the Active Directory domain
This article describes how to install and configure a new Active Directory installation in Windows Server 2003