Adding first Windows Server 2012 R2 Domain Controller within Windows 2003/2008/2008R2/2012 network
When you wish to do this action, please be informed that nothing has changed from the previous (Windows Server 2012) operating system release. That means, all those steps from Windows Server 2012 are still valid for Windows Server 2012 R2.
I would not rewrite that article again, and if you are interested please read the article about Adding first Windows Server 2012 Domain Controller within Windows 2003/2008/2008R2 network on my blog.
I hope you would find it useful.
Author: Krzysztof Pytko