Hi & Welcome to LQ.
Congrads on your server build.
While you are waiting for someone to give step by step instructions; the link to this tutorial should help or at the very least be educational.
We have members here with server class distribution experience that can help you but you'll have to wait for them to join your thread.
-::::-I'm still learning myself.-::::-
The first thing you will want to do is make a backup of the current users and passwords.
Than restore passwords and other files in /etc/.
***See this tutorial and look under "Commands to type on new Linux system"***
https://www.cyberciti.biz/faq/howto-...to-new-server/
You can use the tar and awk commands too:-
https://www.ghacks.net/2010/02/10/mi...ne-to-another/