The guide we talk about here can help Death Knights speed through levels 58 to 60 as quickly as possible, using quests consisting of items that are un-soulbound that may be gathered beforehand and simply mailed to the Death Knight. The counterpart to this guide is the Death Knight Levels 60-70 Shopping List Guide, which includes more items to collect beforehand for turn in quests that reward experience at level 60 through 68 and recommended Bind-on-Equip weapons and armor for Death Knights.
At the beginning, in leveling a Death Knight past their specific instanced starting zone, we've found that at Light's Hope Chapel (right next to where all Death Knights can Death Gate to,) there are quite a few very quests that reward a great amount of XP for just turning in non-soulbound quest items. In addition, these items could be either farmed or bought off the auction house beforehand and simply mailed to the Death Knight soon after character creation, thus making these quests very efficient in gaining XP quickly.
But the only down side to these quests is that a player must have a friendly reputation with the Argent Dawn, a faction that Death Knights start at neutral with. To circumvent this, a Death Knight is able to simply do some of the Western Plaguelands quests to gain reputation for the later turn ins as fast as possible. While most Death Knights will simply finish the initial Death Knight Start zone at level 58 and go to straight Outland and its Hellfire Peninsula, this is a guide for future power leveling Death Knights who want to gain as much early experience as quickly as possible, to be able to get to Hellfire Peninsula at level 60 instead of 58. There have certain advantages when you are at level 60 before entering Outland, such as having access to both Death & Decay and the ability for the Death Knight to have a full 51 points to spend on upper-tier talents. And also, they will receive right out of their initial zone with the Death Knight's amazing quest gear, leveling to 60 using Western Plaguelands' quests allows for very amazingly quick experience gain. Due to the fact that the Plaguelands were tuned for much lower levels of quality in gear than the Death Knight's gear, allowing a Death Knight to simply mow through the enemies with ease that used to give any other class trouble.