Leveling a Death Knight in World of Warcraft is no different than leveling any other class. You go through the same quests (after the starting zone of course) as everyone else. Generally at 58 you head to Outlands and level there. At 68, you are ready for Northrend.
Yes, to get a death knight, you must already have a character which is level 55 or higher on the server you wish to create the death knight.
As long as you have one level 55 (any class or race) on any server on your account, you can make a Death Knight. But you need to keep at least one level 55. Now, if you have a level 55 character, make a Death Knight, and want to delete the character you had, then you can.
You need to have The Wrath of the Lich King Expansion Pack and a level 55 character.
To make a Death Knight character, all you need is a level 55 character on any server. From that moment on, Death Knight becomes available as a class choice on any server when you make a new character. A freshly created Death Knight will start at level 55 in the Eastern Plaguelands, in a special phased leveling zone.
get to level 55 on a trial and download wow wrath of lich king trial
The only current Hero Class in World of Warcraft is the Death Knight. When you have a level 55 character on any server on an account, you will be able to choose the Death Knight as class option in the character creation screen. You can have only one Death Knight per server.
Any race can be a Deathknight. The only choices you have to make is what faction you want it to be, Horde or Alliance, and race. There is also no "best" race for a Death Knight. At the level DK's start, there is not any appreciable different in the passive racial abilities.
You should level whatever class you feel like leveling after your Death Knight. No one can tell you what to level. It is completely up to you.
in my opinion, rogue
The starting gear for Death Knights is pretty good, better than some epics at 60, but if you really need decked out in gear that will be replaced in a level or two you can have a bladcksmith make you some armor probably.
warr
It does not =)