How to deal with two VPSes using ONE domain for DNS?

Hi

I have a VPS – web1.mydomain.com – using ns1.mydomain.com and ns2.mydomain.com. The website - www.mydomain.com - is hosted on this vps. 3 IPs used – server, ns1, ns2.

I just got another VPS – web2.mydomain.com – which comes with 3 IPs.

Question: How do I set up the nameservers for the new VPS? Do I use ns1.mydomain.com and ns2.mydomain.com OR do I use something else, eg. ns3.mydomain.com and ns4.mydomain.com? This new VPS will host some other websites of mine.

Question: I am using mydomain.com:2443/nodeworx for the first VPS (web1). What URL should I use for the new VPS (web2)? How do I go about doing it?

Sorry. I am new to INTERWORX. Came out of CPANEL. I was just told I cannot cluster two VPSes together.