As for seeing yoru work, you'll want to set up a 'mirror' of that domain. Probably you'll want something like hunterjames.dreamhosters.com. then you'll be able to access your website and the MT interace through that sub-doain till you switch the DNS over.
As for FTP and telnet access you should have gotten that information in an welcome E-mail. But it should be somethign on the order of
machine.dreamhost.com/domain.com (for FTP and)
machine.dreamhost.com (for telnet)
If you're not sure what machine or server you're on check out panel.dreamhost.com > Domains > Manage > look and see what's under the Server heading for your domain (not the mirrored one)
hope this helps.