You are in great luck! The best hunter in WOTLK is now here to help you! :D
First off, I want to start by giving you a pat on the back for trying your best and experimenting anything you can think of. That is what I do on my spare time! I try a lot of builds and mix things up to put spice and something to discover any interesting thing about our class.
To perform properly, you have to get alot of things first.
Gear wise.
Stats wise.
Get your gears to BIS plays a big role in performing well.
Head: Sanctified Ahn’kahar Blood Hunter’s Headpiece
Neck: Sindragosa’s Cruel Claw
Back: Vireesa’s Dexterity(Alliance)/Sylvanas’ Cunning(Horde)/Recovered Scarlet Onslaught Cape(Non-Donor)
Chest: Sanctified Ahn’Kahar Blood Hunter’s Tunic
Wrist: Scourge Hunter’s Vambraces
Hands: Sanctified Ahn’Kahar Blood Hunter’s Handguards
Waist: Nerub’ar Stalker’s Cord
Legs: Leggings of Northern Lights
Feet: Returning Footfalls
Rings: Ashen Band of Endless Vengeance & Signet of Twilight
Trinkets: Sharpened Twilight Scale and Deathbringer’s Will
Weapons: Oathbinder, Charge of the Ranger-General
Bow: Fal’inrush, Defender of Quel’thalas
For the meta, get the Agi + additional crit damage
Red = Cap ArP until you get 1400, don't get over that, it's better to get under 1400 long as you are around 99%. Then get agi all the way.
Blue = nightmare tear
Get your hit capped, a miss shot is a big DPS loss.
These are the gears and gemming I prefer using and I believe this is the best gears that can give you the best output you wanted. To those people who say otherwise, I am open to new challenges anytime, we can go DPS race, just drop a pm.
Before you follow this, try your own thing, explore the beauty of our class. Don't just follow someone's spec/gears/gems.