Stupid DNS Question

They say that there are no stupid questions, let's see if they're right.

Right now, www.estes-express.com points to my site, as it should.  I would
like for estes-express.com and my.estes-express.com to point to my site as
well.  I'm assuming this is a DNS issue.  AT&T handles our DNS, do I get
them to add the DNS entries?  Do I have to involve the Internic/Network
Solutions at all (boy I hope not)?  And is there any way to make
my.estes-express.com point at a different page on my site?

Thanks in advance,
Mike Eovino
Webmaster
Estes Express Lines
http://www.estes-express.com

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