Warlock Skill:

http://www.wowhead.com/class=9

Warrior Skill:

http://www.wowhead.com/class=1

Priest Skill:

http://www.wowhead.com/class=5

Paladin Skill:

http://www.wowhead.com/class=2

Hunter Skill:
http://www.wowhead.com/class=3

Death Knight:

http://www.wowhead.com/class=6

Mage Skill :
http://www.wowhead.com/class=8

Druid Skill:
http://www.wowhead.com/class=11

Lord Marrowgar
It is a unique creature created of skeletons. He is the first boss in Icecrown Citadel.
http://www.wowhead.com/npc=36612
This website has more information on this boss.

Lady Deathwhisper
It is a female lich and leader of the Cult of the Damned. She is the second boss in Icecrown Citadel.
http://www.wowhead.com/npc=36855
This website has more information on this boss.

Gunship Battle
It is a unique event that serves as the third boss encounter in Icecrown Citadel.
http://www.wowhead.com/object=201873
This website has more information on this boss.

Deathbringer Saurfang
Deathbringer Saurfang, formerly known as Dranosh Saurfang, son of the most prominent orcish general, is the final boss in the entrance to Icecrown Citadel.
http://www.wowhead.com/npc=37813
This website has more information on this boss.

Here are some interesting World of Warcraft video link:

http://www.warcraftmovies.com/movieview.php?id=147923

http://www.warcraftmovies.com/movieview.php?id=146259

http://www.warcraftmovies.com/movieview.php?id=41784

http://www.warcraftmovies.com/movieview.php?id=91399