cPanel/WHM installation is begun once you receive your "Your new server is ready!" e-mail. The install should complete within 60 - 90 minutes after receiving that e-mail, once it is complete, you can access it at:
http://0.0.0.0:2086
Where 0.0.0.0 is your server's primary IP address, you can reach this information by visiting your Control Panel
Username/Password information for the control panel are the following:
Username: root
Password: {rootpassword}
Where {rootpassword} is the system root password provided in the "Your new server is ready!" e-mail.
Limestone highly recommends changing your root password immediately. By sending your password over e-mail, it has been transmitted unencrypted over the public Internet and may no longer be secure.