Howdy guys, this is me leveling guide for da horde.
I don't know why, but I somehow felt like writing one, or at least starting to write one, and this is it.

It's based on leveling as fast as possible as an undead.

The class I used in this guide is warrior.

I "tried" to use Jame's style of writing, however this is more the version of Bigger, Longer and Uncut, I'd say, anyway.

Have fun and g'd luck!
Level 1:

You?ll start out in Shadow Grave which is a part of the undead starting area called Tirisfal Glades.
Walk up the stairs and get the quest Rude Awakening from Undertaker Mordo.
Run north until you reach Deathknell.
Enter the church at your left and turn in Rude Awakening at Shadow Priest Sarvis.
Get the follow-up The Mindless Ones from Shadow Priest Sarvis.

Now start killing the Mindless and Wretched Zombies just north of the church. Kill the 8 of each, while killing you should be level 2.

Level 2:

Keep on killing them until you are 170 xp away from level 3 and completed the quest.
Go back to Shadow Priest Sarvis and turn in the quest The Mindless Ones.
This will make you ding level 3.

Level 3:

Now get the following quests:

Your class quest from Shadow Priest Sarvis.
Rattling the Rattlecages from Shadow Priest Sarvis.
The Damned from Novice Elreth.

Sell/Repair in the house at the other side of the road and turn in your class quest.
Also when turning it in, learn your new skill(s) for level 2.

Now go west of Deathknell and start killing the Duskbats and Young Scavengers.
Keep on killing these until you've completed The Damned.
After that, go back to the north part of Deathknell and start killing the 12 Rattlecage Skeletons.
Remember: Don't stop killing if there are no more Skeletons, kill some Zombies in meanwhile.

Keep on killing the Skeletons/Zombies until you have reached level 4 and you have completed Rattling the Rattlecages.
I killed about 3 or 4 zombies before I leveled and finished the quest.

Level 4:

After completing both quests go back to the church and:

Turn in The Damned at Novice Elreth and get the follow-up Marla's Last Wish.
Turn in Rattling the Rattlecages at Shadow Priest Sarvis.

Go outside the church and get Scavenging Deathknell from Deathguard Saltain on your left.
Get Night Web's Hollow from Executor Arren across the road.

Sell/Repair at the house next to him and get your new spells for level 4.

Search the houses behind the fence in Deathknell for Scavenged Goods, they look like a pile of boxes, you need 6 of those for Scavenging Deathknell. The tag Equipment Boxes when you mouse-over them though.
After getting the 6 boxes more north until you reach a little camp with some named mobs. (At location 36,61)
There, kill Samuel Fipps, or the other mobs when you have to wait for his respawn. We have to kill him for Marila's Last Wish. Pick up Samuel's Remains from him.