You have several options to choose from to establish a solid build about specing your Hunter. To determine first what you want to accomplish is the real trick to figuring out what will work best for you. Do you want to solo better and want a solid PvP build, are you looking to spec for groups or raids, or do you just want to become a beast at damage? All these are viable options through various builds using the three talent schools for the Hunter. Each school has a specific focus and will appeal to various play-styles.
Beast Mastery focuses on building up your pet abilities and increases your pet's damage output. The advanced section of this tree allows you to tame exotic pets. Beast Mastery Hunters can provide a raid with strong DPS and their buff Ferocious Inspiration is a beneficial proc buff for raids.
Marksman is the high damage dealing school, which focuses on enhancing the Hunter's ranged damage attacks with damage enhancing talents. Marksmen can dish out a great deal of damage and in some cases enhance their groups' damage output through talents like Trueshot Aura.
Survival has ability to enhance your traps. For the most part trap enhancing is the big benefit here, but if damage is what you're looking you will want to try one of the other two trees. A Survival hunter will be a crowd control class for groups. Trap enhancements can aid in slowing or stopping enemies and make this build a good one for crowd control. Survival Hunters can also provide raids with a good mana regeneration buff.
Here we are mainly talking about Beast Mastery tree.
Make sure that you take advantage of all pet enhancing talents that work well together, you can build an efficient Beast Master Hunter. For example, the Beast Master Hunter is given the option to train a tier 7 talent known as Ferocious Inspiration after they have invested 30 points into the Beast Mastery talent school. This talent provides the pet with the ability to buff a party or raid after a successful critical hit by enhancing their damage by up to 3% for ten seconds. This can make the Beast Master an indispensable tool of destruction and a well desired element for any group or raid. There are many talents in this tree that can help by enhancing your pet's damage and increasing their chance to land a critical strike such as Focused Fire. By building these talents you can maximize your pet's potential for dealing a critical strike and thus increase the possibility that he can aid a group or raid with his Ferocious Inspiration buff.
   There are two possible builds for the Beast Mastery line to choose Hunter talents. One shows a strong build with a focus on pet damage and associated talents. The excess points have been invested in the survivability tree to increase survivability and add to ranged combat damage. Another is the same Beast Mastery build, but it shows a way to increase ranged DPS by investing your excess points into the Marksman tree.
Being a Beast Master, the most important thing is focusing on powering up your pet any way possible. If you follow the basic Beast Mastery builds, you will have a few points left over that you are capable of using to try different things.