Even if you're on a new server, you can create a 55 DK, if you have at least a level 55 on any server with that account.

A 55 can boost very effectively through a lot of the 1-60 content. You'll actually be close to 58 by the time you get out of the DK newbie area. You should have, I think, 17 gold or so too, from the DK quests. Nothing stops you from doing the quests mailing the gold, deleting and repeating. It's not a lot, but when you have nothing its tons.