Warlock Pet-The Voidwalker

It's for sure that the Voidwalker is the most used pet by Warlocks in World of Warcraft. The reasons are as follows:
Firstly, for solo PvP the Voidwalker reins supreme as the only pet you should be considering choosing until much later in your Wow career, or unless you're facing a very specific type of enemy.
Secondly, Voidwalkers are the easiest pet to use, they get you out of the most trouble and they level you the fastest by tanking for you. This means that the Voidwalker for Warlocks is like a portable damage shield and personal bodyguard. While you throw mountains of damage at your opponents, the Voidwalker keeps them occupied until they're a smoldering mound of shadow dust on the ground.
Thirdly, the Voidwalker does this by taunting your enemies. Every time you need to take on an enemy who would run into melee with you and kill you in 5 or 6 solid hits, the Voidwalker steps in and takes those hits for you. The Voidwalker is tough and will never let you down when questing and grinding at your level.
When you're questing solo, how do you use the Voidwalker?
While the Voidwalker is an amazing pet for keeping the enemies blades off your back with his taunt powers, you still need to be careful how much damage you cause, otherwise the Voidwalkers taunt won't hold and you'll find yourself under attack.
So, you should start with you set your Voidwalker on defensive stance, meaning that as soon as you attack an enemy, your Voidwalker will be off after them, and will automatically taunt and attack them to keep the enemy off of you.
When using your curses and DoT spells, you need start with curse of agony and hit them with Immolate. Stop right there and wait. Your curse and Immolate will keep on damaging the enemy, and your Voidwalker will keep the aggro of the enemy monster. After a few seconds, the monster will be sufficiently angry with the Voidwalker and you can continue casting at it.
For optimum leveling efficiency, you probably buy the absolute best wand you can afford. A good wand will cause close to as much damage as your shadow bolt spell, but won't cost you any mana.
Leveling with the Voidwalker, the trick isn't just staying alive or killing stuff the fastest, it's killing it the most efficiently. That means that you ensure that you don't slam the monster you're fighting right from the beginning because you'll cop a ton of damage and have to rest a lot, which will slow your leveling down. It also means that being conservative with your mana, which is why we recommend a good wand to help you conserve mana for your expensive curses and Immolate spells. If you burn through all your mana quickly, you'll simply find yourself needing to rest and again, that'll slow you down.
What you do is to let your Voidwalker take a ton of punishment and use his consume shadows ability after the fight to heal him up; it's much faster than healing yourself, and much faster from a leveling standpoint. If you do this right, you should find yourself almost never needing to sit down and rest, and when you do, it's only for a very short time.