In Silvermoon City (and the Blood Elf starting areas) are Warlock Trainers. Simply ask a guard for directions by right-clicking them, and selecting "Class Trainers" and "Warlock". An arrow will appear on your map towards the trainer.
Note that a warlock can train with any Warlock trainer, regardless of race. It does not need to be a blood elf per se.
The Voidwalker is a warlock pet you gain at level 10 after you finish the quest, "The Binding".
To summon the Felsteed, the warlock must be level 20. When you learn the spell from your Warlock trainer, you will automatically learn the riding skill (Apprentice Riding) at the same time.
You get pets :)
Undead.
The most evil class, in my opinion, is the Warlock because you can be a Demonology Warlock and a Destruction Warlock.
The warlock
Just choose "warlock" under the character selection menu. Well first of all you should of put how can you be a warlock in world of warcraft that question is very misleading
Depends on whether you are Horde or Alliance - Alliance learn them from their trainer in the Slaughtered Lamb in Stormwind or you can get an imp in Northshire after the quest 'The Stolen Tomb', or in the 'bad area' of Iron Forge. Horde, the trainer in Undercity or Ogrimaar.
Incinerate can be learned at level 64.
One can find a guide on World of Warcraft warlock PvP builds on noxxic dot com. Additional information can be found on wowhead dot com and wowwiki dot com.
Sabrie, Deathshadow, Deathlock, Shadowmaster, Shadowlock
In popular culture, a warlock is a male witch.