Beast Mastery with pet and hawks, 10 to 60

How to play it

This build leaves the dirty work to your pet: it takes the hits, you stay at range and, from 25, you also have a pair of hawks attacking your target. The result is one of the most comfortable ways to level solo, with little downtime and several safety exits if something goes wrong. The points are 32/14/5: almost everything in Beast Mastery, the rest split between Marksmanship and Survival.

The path, level by level
10-14: Deadly Aspects, all 5 points. With Aspect of the Hawk active, Auto Shot can give you +30% ranged attack speed for 12 seconds: one of the Hunter's best talents.
15-24: Focused Fire (+2% damage for you and your pet while it is with you), Improved Revive Pet to get it back up quickly and cheaply, one point in Endurance Training, Pathfinding for a faster Aspect of the Cheetah, Bestial Swiftness and the first points of Unleashed Fury.
25: Summon Hawk, the talent that matters most in the tree. It summons temporary hawks that attack your target, up to two at once, and shares its cooldown with Arcane Shot.
26-35: the rest of Unleashed Fury, then Ferocity, for pet and hawk damage and crits, and Bestial Discipline: more Focus for the pet and half of your Mana regeneration carrying on while you cast.
36: Intimidation, a stun and threat for the pet. 37-39: Frenzy.
40: Bestial Wrath, +50% pet damage, and the pet also becomes immune to crowd control.
41-60: one last point in Frenzy, then Marksmanship with Lethal Attacks (+5% crit), Careful Aim (Attack Power from Intellect) and Rapid Killing (shorter Rapid Fire cooldown and a stronger shot after a kill), and to finish Improved Tracking (+5% damage to the creature type you are tracking) and Improved Stings.

The hunt, one enemy at a time
Mark the target with Hunter's Mark, send the pet in and let it land a few hits before you shoot, so the threat stays on it. Once the enemy is busy with the pet: Serpent Sting, then Summon Hawk as soon as it is ready (keep two hawks out and do not recast it early), Aimed Shot as soon as it is ready and Auto Shot for the rest. Arcane Shot only if you have plenty of Mana and both hawks stay out; Disengage if the enemy turns on you. For elites and long fights add Bestial Wrath, Rapid Fire and Intimidation. Against packs use Multi-Shot instead of Aimed Shot, since they share a cooldown, then Explosive Trap and, if there are many enemies, Volley; carefully, because the pet holds threat on several enemies poorly.

For gear, the first thing is ranged weapon damage, preferably on a slow weapon, because Aimed Shot benefits from it. Then Hit, Agility and crit, which also helps the pet and Frenzy. Intellect is worth more than usual: with Careful Aim it becomes Attack Power, on top of giving you more Mana. Spirit only counts while leveling, and Stamina comes last.

Strengths

Among the strongest builds for leveling solo.
Excellent damage on one target at a time.
The pet takes the hits for you.
Several ways out: Feign Death, Disengage, traps.

Weaknesses

Limited AoE damage.
The pet holds threat on several enemies poorly.
No self-healing.
In trouble when an enemy reaches you in melee.

Notes

Milestones: pet quest at 10, Aspect of the Cheetah at 20, Summon Hawk at 25, Feign Death at 30, Bestial Wrath at 40.
At 14 pick up the Cozy Sleeping Bag quest: it gives an experience bonus that stacks.
Never stop: one enemy at a time and, while you loot, already send the pet at the next one.
For leveling the bear is a great choice: Swipe hits several enemies and helps it hold them.
In Forever all pet families deal the same baseline damage, but happiness and loyalty still matter, so feed your pet; the higher ranks of its abilities are still learned by taming.
Do each dungeon once, with its quests; stop at campfires and log out rested.
If Improved Stings does not convince you, those points also fit well in Endurance Training.
Race: Night Elf for the Alliance (Elune's Light, Shadowmeld), Orc for the Horde (Command gives +5% pet damage, plus Blood Fury).