Hello raysonbl,
1. Registering name servers
The welcome e-mail asks me to register the private name servers with my registrar. However, as the domain was already registered via Lunarpages for a shared hosting plan there is no direct contact with the registrar (in my case: Tucows). At least I don't know which user name and password to use in order to log in directly there.
Although, the domain was registered by Lunarpages, it is still your responsibility to create private nameservers in it as the domain owner. The username and the password will be the same as for your account with us that you use to access the Customer Account Pages.
2. Making web service work
When I use the IP to access the new server with HTTP I get a message from Plesk saying
"If you see this page it means:
1. hosting for this domain is not configured
or
2. there's no such domain registered in Plesk "
Which steps are necessary to make the web server show the normal "index.html" file in the "httpdocs" directory?
Usually, upload of an index file is enough to httpdocs folder is enough.