If its taken more then a few hours to receive a reply, this may be an indication that your message was never recieved. You should have received a notification of message received within minutes of signing up.

You would need to make sure you email support@lunarpages.com or use the online support.lunarpages.com page.

Since you are using a MSSQL, you would definently need a windows hosting plan, you can also host the MYSQL database on windows hosting.

Only "extra" fees would be is if you had Your domain registered through Lunarpages, domain registration is $19.95 per year.

NOTE:  If you already own a domain name, and switch hosts, your current registrar would remain the registrar of your domain name unless you request a domain registration transfer. 

There are also extra feature you can get with hosting accounts, such as Dedicated IP, Premium Restore Service, and SSL Certificate however not all accounts require these.

You can see the yearly prices for these by going to https://secure.lunarpages.com/signup/order:windows,Win3 and scrolling down to the bottom of the page.