newbie Firts Installation which is the next step?

Question 1: Hi team does is mandatory change the hostname? i have the VPS in CONTABO and their VPS hostname its come by default an hostname like : VIM45454.contabo.net.

if the Answer is YES then I have to Set Nodo1.codexdigital.co where codexdigital.co is the main domain how can I set these hostname because the command:

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hostname srv1.example.com change the hostname temporary.

Question 2: after install centos webpanel on 7.6 which is the next step?

Setup Nameservers? or nstall php-pfm? or setup Setup default Web Servers Nginx & Varnish & Apache?

Question 1: Hi team does is mandatory change the hostname? i have the VPS in CONTABO and their VPS hostname its come by default an hostname like : VIM45454.contabo.net.

I recommend having your own hostname. Check this post for hostname setup along with greenpadlock
http://forum.centos-webpanel.com/how-to/(tutorial)-how-to-install-ssl-on-hostname/

Question 2: after install centos webpanel on 7.6 which is the next step?

The next step is to configure web servers. Best setup is "Nginx & Varnish & Apache". To configure web servers, Go to Webserver Settings>>>Select Web servers

The varnish is crap.
Better using nginx+php-fpm 7.x+opcache