I don't understand DNS settings for hostname and hostame main domain

Hello to all.

I reviewed all documentation, and all is very well documented, except: main domain settings and DNS settings for that domain and hostname.
What do I need to do before CWP installation with my domain which will be part of hostname of my server running CWP? To be more clear - I have IP address from which I can access CWP, OK; but - do I need to change settings on my domain registrar prior to installation, and of so - which of them?

A record = where? On CWP or domain registrar? Nameservers - I already have nameservers which points to my VPS server provider, what with them.

For me that part is a little bit vague, please someone care to explain me about this? Thank you...

Hi, if you have an external DNS you can leave CWP's nameservers and does not matter what they have.
Just manage your DNS at the external DNS

You can use external DNS like cloudflare and just point the a and www domain to your centoswp server.