This is the Ninjago timeline on my opinion. You don't have to agree with everything.
10000 BC: The First Spinjitzu Master creates Ninjago.
10000 BC: The FSM battles and defeats The Overlord.
10000 BC: The FSM creates the Realm Crystal and brings The Serpentine from Chima.
1956: Yang creates Airjitzu.
1958-9: Wu and Garmadon are born.
1960: The Green Ninja Prophecy is written.
1961: Garmadon is bitten by the Great Devourer.
1962: Nadakhan creates his crew.
1962: Captain Soto and Nadakhan battle and Soto wins the fight.
1962: The Destiny's Bounty shrinks killing Soto and his crew.
1975: Dr. Julien builds Zane.
1976: Wu and Garmadon defeat Samukai.
1976: Garmadon begins training under Chen.
1976: Wu begins training Morro.
1976: Morro leaves Wu but dies in the Caves of Despair.
1977: Wu defeats villains such as Kirchonn the Invincible and the Time Ninja.
1977: The Serpentnie War breaks out.
1977: The Elemental Masters defeat the Serpentine using the Scared Flutes.
1977: The Anacondrai Generals are banished to the Cursed Realm
1977: Acronix and Krux betray the Elemental Alliance, but are defeated with the Time Blades.
1978: Krux escapes the Time Vortex.
1978: Ray and Maya find the Reversal Time Blade and hide it in the Boling Sea.
1999: The First Spinjitzu Master leaves a secret messege about his tomb to Wu in his staff.
2000- The Ninja are born.
2001: Lloyd is born.
2001: The First Spinjitzu Master dies.
2001: Yang turns himself and his students into ghosts with the Yin Blade.
2001: Garmadon turns evil and is banished to The Underworld where he takes over from Samukai.
2010: Wu wisits Dr. Julien and meets Zane for the first time.
2010: Dr. Julien dies.
2010: Wu hides the Golden Weapons, makes a map and gives it to Ray.
2010: Krux kindaps Ray and Maya.
2011: Samukai resurrects Dr. Julien and the later degsines wehicles for him.
2011: Samukai imprisons Dr. Julien in a lighthouse and places a Leviathan to guard him.
2011: Dr. Julien builds Echo Zane and Tai-D.
2011: Garmadon frees some of Wu's old enemies and orders them to defeat Wu.
2011: Wu invites Kai, Jay, Zane and Cole to his Ninja Team.
2011: Lord Garmadon leads a hunt for the Golden Weapons.