You have waited Wrath of the Lich King for a long time and anticipated to make your own Death Knight, but now you have got it at level 55. What the thing you want to do is to level him or her to level 80 so fast. In the pinch, you must follow the appropriate steps to level them as quickly as possible. The detailed steps we will make mention of are as follows.
   The first step is to complete the quests that are class specific in the Death Knight starting area. You start your Death Knight with zero talent points, doing these quests not only give you a full set of rare gear but give you your talent points and mount as a reward. So it is vital that you complete every single one.
   The second step is to move to Chillwind camp in the plaguelands and do the quests there, then move to Lights Hope chapel and do those once you have completed all the quests given to you in the starting zone. These two areas should get you 60 fairly easily. Skip instance quests if you want to get to 80 in five days. This will take swift movement on your part. You should know all quests you encounter, and their locations because you presumably already have at least one completed level 70 character. If not, you can download quest helper which will guide you along the way.
   The third step is to move to Winterspring after you have fulfilled the eastern and western plaugelands. In Winterspring, you can do all the quests which should get you halfway or most of the way through level 60.
   The fourth step is for you to head to Outlands. You should go to Netherguard keep and run to the portal to Outlands then take the quest right before going through. Follow all directions and they will lead to you Honorhold. With the exceptions of instance and PvP quests, to complete all quests available to you are a waste of valuable time. Once you've completed Honor hold, move to the surrounding areas. The Druid is camping along the road and the Temple of Telhamet. Once you've completed these moves to Telrador in Zangarmarsh where there are several questing places, start with the town of Telrador, then move to Cenarian Refuge, then on to Sporagar, then Orebor Harborage. Once you've completed these area's you should be at least level 63.
   The fifth step is to go to the Terokkar Forest. As long as you first enter this area, you'll come across a quest to kill terro moths, do this quest chain and continue on to Shattrath city in which you will be asked to take a tour of the city. The quest seems pointless but it is important for you to do this because it is a good chain quest that gives you excellent XP. In this town, you must fulfill all the quests and then move on to Alerian Stronghold. In Alerian you will find some quests for your level but you won't be able to complete them all at this time. Just do what is yellow to you and move on to the Blades edge Mountains.
   Then you can go to Stormwind and run to the harbor that was newly placed. Take the boat on the far right to Valiance Keep. You will find a few quests inside the keep. You can complete those quests, which they will lead you to other parts of the Tundra's landscape. Complete all quests in this area, including the Druid camp, airstrip, amber and kaskala. You will now be 71. This will end day two.
The rest is pretty easy, just follow the quests, they will, at the right times, send you to the next area. In addition to instance and quests, you can fulfill all quests later. Take the next three days to gain 2-3 levels a day. This is very time-consuming so you should be made ready.