First, web pages are resolved using A records from a DNS server.
Since your domain has DNS done by somebody else, it's that somebody else that has to hold the A records. *So, if you want www.btshadows.net
*to resolve to your box, so you can host the webpage for that, you need an A record to point to your IP address.
Honestly, you don't need any thing related to DNS servers on your local box.
If you need dns service, you can use www.mydomain.com
* they offer free DNS service, very cool, and quite a few people here use them.
Second, Courier, VERY good choice, I love it.
You will need an MX record. * MX records are to mail servers like A records are to web pages. *It's the Mail eXchange record, so that SMTP servers know where to send all the mail for @btshadows.com *
Once again, www.mydomain.com
can handle this, since it's just another DNS entry.
Hopefully I've helped, and not added more confusion?