Once you get your site all set up, you can get all the DNS info you need by going to the panel here for Manage Domains and click DNS. You can then update your DNS server with the A records, etc., that you need.
Keep in mind that IP address here change from time to time, though very infrequently.
It's much more handy to use DreamHost for DNS if your entire domain resides here. It doesn't matter where it's registered, though.