The default DNS settings in Plesk should be sufficient.
But I found it easier to let my Plesk have complete control over my domain names... how? Well, it took a few steps, but it shoudl work for you too. (replace DOMAIN with your primary domain name, and PIP with your servers primary IP address, and SIP with the servers secondary IP address).
Step 1: log into my registrar and create the nameservers:
NS1.DOMAIN.COM --> PIP
NS2.DOMAIN.COM --> SIP
Set the domain's nameservers in the registrar to:
NS1.DOMAIN.COM (bind to primary IP, if you have the option)
NS2.DOMAIN.COM (bind to secondary IP, if you have the option)
Step 2: Log into your Plesk Control Panel, and enter your primary Domain's section
Create the following A records:
NS1.DOMAIN.COM --> PIP
NS2.DOMAIN.COM --> SIP
Once the DNS has propigated and reached such sites as internic, your Plesk should have full control of the domain.
Currently, you have your registrar sending DNS queries to NS1.EV1SERVERS.NET, but have the nameservers in plesk set to use NS1.
.COM (in this case, ns1.expobusiness.us).
Also, being new to Plesk, make sure you properly set your servers hostname (preferably before you go tweaking and adding everything). There is a tool on here that will make all the changes for you, except for one. When you pick the hostname for your server, you will need to make sure that the name exists, and points to your servers primary IP address. The howto is found here: http://forum.ev1servers.net/showthread.php...&threadid=20397
Good luck.