It goes without saying, however, that if you do decide to create a DK, you’ll have to fulfill the requirements to unlock them. These requirements can be found if you hover over the race icon in the character screen.
These Pandaren and Allied DKs will begin with a new starting experience and complete an introductory quest with Bolvar. At that point, you’ll be able to continue your adventures as either Horde or Alliance. You’ll receive the Acherus Deathcharger class mount after completing the introductory questline should you decide to create a DK. Allied DKs will also receive their racial mount.
Learn more here.