What not to wear.

Early on in your questing you will be given a choice of multiple quest rewards but what do you pick? All armor and weapons have a series of numbers that tell you about their quality (stats), but which set of numbers are most important? By knowing what type of gear is best for your class and what stats are most important will allow you to get the most out of your character. So here comes the break down;

Armor

Cloth armor: Mage, Priest, Warlock

Leather armor: Druid, Monk, Rogue, Hunter (until level 40), Shaman (until level 40)

Mail armor: Shaman, Hunter, Warrior (until level 40), Paladin (until level 40)

Plate: Warrior, Paladin, Death Knight

Weapons

Axes One-Handed: Death Knight, Hunter, Monk, Paladin, Rogue, Shaman, Warrior

Daggers: Hunter, Druid, Mage, Priest, Rogue, Shaman, Warlock, Warrior

Fist Weapons: Hunter, Druid, Monk, Rogue, Shaman, Warrior

Maces One-Handed: Death Knight, Druid, Monk, Paladin, Priest, Rogue, Shaman, Warrior

Polearms: Death Knight, Hunter, Druid, Monk, Paladin, Warrior

Staves: Hunter, Druid, Mage, Monk, Priest, Shaman, Warlock, Warrior

Swords One-Handed: Death Knight, Mage, Monk, Paladin, Rogue, Warlock, Warrior

Axes Two-Handed: Death Knight, Paladin, Shaman, Warrior

Maces Two-Handed: Death Knight, Druid, Paladin, Shaman, Warrior

Swords Two-Handed: Death Knight, Hunter, Paladin, Warrior

Bow: Hunter, Rogue, Warrior

Crossbow: Hunter, Rogue, Warrior

Gun: Hunter, Rogue,Warrior

Wand: Mage, Priest, Warlock

These are all the different kinds of weapons that a class "can"  use. This dose not however mean that you "should" use them. What Weapons you use should be decided by you're primary and secondary stat. Each class has one stat that benefits them more then any other. I'm going to list them all for you along with the next most important stat to help you pick if their is a tie.

Stats

Death Knight

Blood; Mastery > Stamina
Frost; Duel Weld  Melee hit (7.5%) > Strength, Two-Handed Strength > Expertise (7.5%)
Unholy; Strength > Expertise (7.5%)

Druid

Balance; Intellect > Spell hit (15%)
Feral; Agility > Expertise (7.5%)
Guardian;  Stamina > Agility
Restoration; Spirit > Intellect

Hunter

Beast Master; Agility > Expertise (7.5%)
Marksmanship; Agility > Expertise (7.5%)
Survival; Agility > Expertise (7.5%)

Mage

Arcane; Spell hit (6%) > Intellect
Fire; Intellect > Spell Hit (15%)
Frost;   Intellect > Spell Hit (15%)

Monk

Brewmaster; Expertise (15%) > Melee Hit (7.5%) > Agility
Mistweaver; Spirit > Intellect
Windwalker; Agility > Melee Hit (7.5%)

Paladin

Holy; Spirit > Intellect
Protection; Stamina > Melee Hit (7.5%)
Retribution; Strength, Melee Hit (7.5%)

Priest

Discipline; Spirit > Intellect
Holy; Spirit > Intellect
Shadow; Intellect > Spell Hit (15%)

Rogue

Assassination; Agility, Melee Hit (7.5%)
Combat; Agility, Expertise (7.5%)
Subtlety;  Agility, Melee Hit (7.5%)

Shaman

Elemental; Intellect > Spell Hit (15%)
Enhancement; Agility > Expertise (7.5%)
Restoration; Spirit > Intellect

 

Warlock

Affliction; Intellect > Spell Hit (15%)
Demonology; Intellect > Spell Hit (15%)
Destruction; Intellect > Spell Hit (15%)

Warrior

Arms; Melee Hit (7.5%) > Expertise (7.5%)
Fury;  Melee Hit (7.5%) > Expertise (7.5%)
Protection; Stamina > Melee Hit (7.5%)

Ok, That's the lot. Make sure to follow your stat priorities and don't let your weapon clash with you boots.
And remember we're all noobs, some of us just fly the flags a little higher.