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Generally, I have added a member server to the existing domain, then promoted it and installed ADDS. DNS can be installed as part of that process. Move FSMO roles to the new DC after you are sure the directory has replicated properly and that DNS is working. Make it a Global Catalog server as well. Migrate any other roles from the old to the new (e.g. DHCP, Remote Access).
Make sure to update DHCP with the new IP of the preferred DNS server. Edit any router NAT entries that were pointing to the old server. Once you are certain everything is on the new server and the clients will refer to it for DNS, switch off the old one and see what happens. If you encounter any problems switch the old one back on, fix the issues then switch off and test again. Once the new DC can run on its own without any issues on the network for several days you can then backup, gracefully remove ADDS, demote, wipe and upgrade the old server.