Server 2003 / DCPROMO

After installing Server 2003 what do you usually do prior to loading DCPROMO?
What would be the typical procedure involved in setting up the server, I guess in real world terms.

Just setting up a single domain controller for now w/AD , DNS, DHCP etc. for xp/2k clients.

Also how long does it take for cross-domain replication of Active Directory; lets say if you have more than one server you will no doubt have a copy of the same AD on both servers.

Thanks