Im working on my enchanting atm, its at 77,archery at 90, smithing at 100. What all do I need to do to get my bow to do crazy amounts of damage ?

You need alchemy. Use enchanting to make alchemy gear, then put on the gear and make +enchanting potions. Take the potions and increase enchanting to make even better alchemy gear. Repeat that until you reach the cap, don't remember it. Then use alchemy to make smithing potions and enchating to make smithing gear and put that together to make your bow. You can also enchant certain pieces of your gear to add damage to your bow such as your helmet.

Let's see...
I'll assume you will get Archery at 100.

• Overdraw Perk (Archery Tree) : Level 5 - Bows do 100% more damage.
  --> Daedric Bow (Legendary) = 92 Damage
  --> Daedric Arrows = 20
  --> 92+20 = 112
  
  
• Enchanted gear (Helmet, Gloves, Necklace, and Ring)
  With Enchanting 100 and a Grand Soul Gem (Grand Soul) you can get 40% bonus damage each
  --> 40% (Helmet) +40% (Gloves) +40% (Necklace) +40% (Ring) = 160% Bonus
  --> 112+179.2 = 291.2
  
  
• Deadly Aim Perk (Sneak Tree): Bows do three times damage (if Hidden/Undetected)
  --> 201.6 x3 = 873.6
  
  
• Critical Shot (Archery Tree): Critical Chance (20% at Level 3) + Critical Damage bonus (50% more Critical Damage)
  -->Let's assume critical damage was at 0% first, it would be: 873.6+436.8 = 1310.4
  --> If it was 100% at default and the bonus made it 150%, then = 873.6+1310.4 = 2184
  
  
• Total:
  --> If opponents were naked= 2184 possible true damage
  --> If they are not...still a lot

///

If my math is correct...
That's a lot of damage so far, eh? But you want more... Q_Q

• Potion. More damage I believe (can only use one)
  --> Elixir of True Shot = Fortify Archery 50 pts for 60 secs
  --> No idea where this brings you.
  
  
• Exploiting the Smithing/Enchanting Potions (never tried it, don't quote me) and upgrading again
  --> More damage.
  --> Absolutely no idea where this brings you.
  
  
• Alchemy Fortify Potions
  --> Too much damage for comfort.

Updated with Enchanted Gear. .__.