The best faction is the one you are willing to use. Try both factions and see how you like each. The one you like the most is the one that is the best.
The best dancer for each faction would be: Female Blood Elves Male Night Elves
The Guardians of Hyjal are a new faction that will be appearing in World of Warcraft: Cataclysm. See the related link for more detail.
You get to pick another race, from the available options, and customize it.
Athene...best paladin in the world
World of Warcraft is the best.
Yes.
The best mage on World of Warcraft ever.
Undead.
The MMORPG World of Warcraft is worth billions of dollars. There are currently over 10 million people with active accounts, plus all of the paid character services like realm transfers, name changes and faction changes.
World of Warcraft is a fun game. You live the life of a fantasy person. You train to lvl 80, get better skills, learn professions. You can pick your race, your faction and your class. the races are a human, night elf, gnome, dwarf, and dranei for the Alliance faction. the races are orc, blood elf, tauren, undead, and troll for the Horde faction. the classes are: warrior, hunter, warlock, death knight, shaman, paladin, mage, priest, and druid. try it and have fun!
Yes you must be Exalted with the Nethwerwing faction found in Shadowmoon valley and have epic flying to attempt to start gaining rep.
In World of Warcraft, Goblins are short green creatures that you do buisness with sometimes. They control the Neutral Cities of Booty Bay, Gadgetzan, Ratchet, Everlook, and Mudsprocket. Coming in Cataclysm, they will be a playable race for the Horde faction, and have several pretty decent racial abilities.