Running Virtualmin on Amazon EC2 using EBS

Hello. First of all thank you for the great products that you've made. I want to ask a few question about using Virtialmin on Amazon EC2 and also for "how it works".

1. Understanding the Virtualmin/Cloudmin and usermin. I read the documentation, but i'm not 100% sure for these: I have to user virtualmin to create a virtual servers. Than i have to use cloudmin to manage them, and usermin to manage the local domains/websites running on one virtual server?

2. Setting up a virtualmin on Amazon EC2. I follow the instructions provided: http://www.virtualmin.com/documentation/aws/virtualmin_gpl_ami and the virtual machine is running. But when i terminate the machine, all updates that i've made are gone. So i have to "save" tha AMI on EBS, but i can't do that, because the button "Create image (EBS AMI)" is not clickable under the instances tab into AWS Managment. a.) is it possible to make a EBS AMI of Virtualmin GPL? b.) if it's not i have to use Virtualmin Pro?

3. Domain names understanding: I've already registred domain name. But i don't know how to setup a DNS server, becouse i have to put the dns servers, into alphabetic format into the panel of registrar. So, i can't place there the static IP(that i've already assigned to the instance).

After i use other dns servers, and make a MX record points to my elastic ip, the web page is not showing. (i've already setup a virtual server with that domain and wait 72h for dns refresh).

I will be very pleased if you answer to my questions.

Thanks in advice. Best regards, Kristiyan Ivanchevski