Creating a Character

When choosing a character to create in World of Warcraft, there are many choices before you. There are eight races and nine classes available, but the game's primary choice when it comes to character creation is the faction you wish to fight for. You can join the Horde or the Alliance, and your choice here determines much of what you can and cannot accomplish in the world.
You can only group and talk to players in your own faction. You also can only view and befriend players in your faction when using the in-game social commands. The intent is to make you feel like a member of one enormous team, while at the same time setting up the other faction as an enemy or, at best, a rival. Thus, if you wish to play with your friends, you will want to all join the same faction. Other content, such as the zones you can visit and the quests you can accomplish, are also organized by faction. Some quests can only be completed by Horde players and others can only be completed by Alliance players. Some zones offer cities and interactive NPCs for one faction, but are completely hostile to the other.
The Horde side includes the orc, tauren, troll, and undead races, while the Alliance side includes dwarves, gnomes, humans, and night elves. All classes are equally well-represented on both sides, with the exception of the shaman and paladin classes. Shaman can only be played by Horde players, and Paladins are exclusive to the Alliance side.