Okay, I have rolled 3 Hunters, one being my main which is 70, one to 30(Old 29 Twink) and one to 19 just recently.
This is an Alliance guide, but the gear is the same, except you can't get one of the weapons.
In this guide I will only explain Armor, Weapons, Enchants, and Talent Specs. Okay, on to the armor, the enchants will be in brackets.
Head - Pathfinder Hat of the Monkey/Eagle ( Try for the 9/9 ones - Auction House) [100 HP/8 AGI]
Neck - Sentinel's Medallion (WSG Reward, Level 28 version)
Shoulder - Mantle of Thieves (Auction House)
Back - Parachute Cloak (This requires that you have 225 Engineering) [12 Agility]
Chest - Raptor Hunter Tunic (You get this from doing the Raptor Mastery quest in Stranglethorn Vale, I also suggest you do the others as well as to get the Gun or bow) [150 HP or +6 Stats to chest]
Wrist - Barbaric Bracers (Auction House) [+9 Stamina]
Hands - Razzeric's Racing Grips (Obtained in Shimmering Flats at the Mirage Raceway) [15 Agility or 26 Attack Power]
Waist - Highlander's Padded Girdle (AB Reward, I think it is 20 marks and 200 or so honor pts.)
Legs - Troll's Bane Leggings/Petrolspill Leggings (Auction House) [Nethercleft Leg Armor/Nethercobra Leg Armor]
Feet - Highlander's Padded Greaves (Also an AB reward for the same price as the AB belt) [+7 Stamina]
Ring 1 - Protector's Band (WSG Reward, level 28 version)
Ring 2 - Heavy Silver Ring of the Monkey (Auction House)
Trinket 1 - Insignia of the Alliance ( Cost 2800 honor points, this is a must have)
Trinket 2 - Arena Grand Master (Obtained from obtaining 12 Arena Masters from the chest in The Great Arena)
Okay there is the gear, now on to the weapons...
Weapon - Archeus (Obtained from a quest in Duskwood, you have to find a gravestone, then take the quest and go to Darkshire, its alot of running and you have to kill a 35 elite so bring a friend.) [Savagery]
Weapon - The Butcher (Auction House) [+15 Agility]
Weapon - Sentinel's Blade (WSG Reward, Level 28 version) [+15 agility]
Weapon - Master Hunter's Rifle (Obtained from doing all of the Mastery quests in Stranglethorn Vale) [+7 Damage Scope]
There's all of the weapons =)
Okay on to the talent specs!
0/20/0 - Full Marksmanship build, expect high damage!
5 in Improved Concussive Shot
5 in Lethal Shots
2 in Go For the Throat
2 in Rapid Killing
1 in Aimed Shot
5 in Mortal Shots
0/11/9 - Survival/Marks Build, more or less to go toe to toe with warriors or rogues when they have you slowed down and your trinket is on cooldown, but still with some good damage with marks.
Marks
5 in Improved Concussive Shot
5 in Lethal Shots
1 in Aimed Shot
Survival
2 in Savage Strikes
3 in Hawk Eye
2 in Improved Wing Clip
2 in Entrapment
For a pet I suggest either a Boar from RFK or the highest level cat/ravager you can find.
That's all, hope you like it and enjoy your new hunter twink!