In terms of strictly novels, in order of events, roughly speaking...
Rise of the Horde
The Last Guardian
Tides of Darkness
Day of the Dragon
Beyond the Dark Portal
Lord of the Clans
Blood and Honor
Arthas
Cycle of Hatred
The War of the Ancients Trilogy (The Well of Eternity, The Demon Soul, and The Sundering)
Stormrage
Night of the Dragon
The Shattering
Twilight of the Aspects
Wolfheart
Tides of War
Some of these span periods of time that overlap, but in terms of when they end, this is a fairly decent chronological scale.