Secrets of the Timeless Isle

This quest is all about the new Timeless Isle. The coins can be gained from several sources:

One Time Quests

• Main Questline: Auto picked once you enter Vale of Eternal Blossoms
  
  1. 
     
  2. A Flash of Bronze (Alliance / Horde).
  3. 
     
  4. Journey to the Timeless Isle (Alliance / Horde) - rewards [currency=777 amount=500].
  5. 
     
  6. Time Keeper Kairoz (Alliance / Horde) - rewards [currency=777 amount=500].
  7. 
     
  8. • Time In Your Hands Possible -[currency=777 amount=1000].
     • A Timeless Tour - rewards [currency=777 amount=500].
  9. 
     
  10. Hints From The Past ± [currency=777 amount=0] (Quest requires you to buy an item for coins and then gives coins)
  11. 
      
  12. • Timeless Treasures - reward [currency=777 amount=50].
      • 
        
      • The Essence of Time - reward [currency=777 amount=1000].
  13. 
      
  14. • Strong Enough To Survive (Weekly Group) - reward [currency=777 amount=1000].
      • 
        
      • Empowering the Hourglass (Weekly) - reward [currency=777 amount=1000].
  15. 
      
  16. A Vision in Time reward [currency=777 amount=1000].
  17. 
      
  18. Refining The Vision reward [currency=777 amount=1000].
  19. 
      
  20. Seeking Fate reward [currency=777 amount=1000].
  21. 
      
  22. Hidden Threads reward [currency=777 amount=1000].
  23. 
      
  24. Courting Destiny reward [currency=777 amount=1000].
  25. 
      
  26. One Final Turn reward [currency=777 amount=1000].
  27. 
      
  
  
• 
  
• Wayshrines Of The Celestials Introduces you to the blessings of the celestials on the island. Rewards [currency=777 amount=250].
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• Timeless Nutriment Introduces you to the edible finds on the island. Rewards [currency=777 amount=250].
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• The Last Emperor Introduces you to the [npc=73303] himself. Rewards [currency=777 amount=500].
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• Rolo's Riddle Solve a riddle. Rewards [currency=777 amount=250].
• 
  

Weekly Quests:

• 
  
• The Celestial Tournament (Account-wide) Pet Battle-Tournament. Rewards [currency=777 amount=1000]
• 
  
• Strong Enough To Survive (Group) Kill 5 Rares out of 33 possible. They are all listed in Timeless Champion. Rewards [currency=777 amount=1000]
• 
  

Daily Quests:

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• Path of the Mistwalker (Group) Kill 20 elite mobs on the Timeless Isle. Rewards [currency=777 amount=1000]
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• Little Tommy Newcomer (Account-wide) Pet battle. Rewards [currency=777 amount=500]
• 
  
• A Timeless Question Answer history questions about Azeroth. Rewards [currency=777 amount=100]
• 
  

Buying for [currency=396]
[npc=73305] will have [item=104014] for sale by the price of [currency=396 amount=500].
Note that the item requires you to be honored with [faction=1492] which is gained by killing mobs on the Timeless Isle so you can't get around the farming.

Killing Non-Elites Listed in Killing Time
Killing the several Non-Elites on the island will reward ~[currency=777 amount=15]

Killing Elites Listed in Path of the Mistwalker
Elites drops 15-20 [currency=777] each.

Killing Rares Listed in Timeless Champion
Some Rare Elites drops 200-300 while others drop 700-900 [currency=777].
All rares might also have a chance to drop [item=104034] which contains ?-? [currency=777]. [npc=72193] have a guaranteed drop of [item=104035] which contains 800-1000 [currency=777].

Looting Chests
There is several types of chests such as [object=221670] and [object=222687] around the island.
Looting chests which are found all around the island will reward you 50-100 [currency=777].
Map
Extreme Treasure Hunter - Treasure, Treasure Everywhere

If any of this information is inaccurate or false please tell me by replying to this comment!
_{This entire post is a double from my own post.}

Do you need to loot 5000 coins or you need to have 5000 coins.

Could you get the coins ahead of being on this quest?

You need to "have" 5000 Timeless Coins. You lose them by completing the quest as well. You can get the coins before this quest and it should work fine.