The shadow priest is the heart of the priest soloing talent build. You basically have a little bit lower nuking power of a mage, a little bit lower damage over time spells of a warlock, and basic healing abilities of the priest class. Perfect for the soloing caster. Here's what you need to focus on:

Levels 10-14 - Spirit Tap (5/5)
Levels 15-19 - Improved Shadow Word Pain (2/2) and Shadow Focus (3/5)
Improved Shadow Word Pain - longer duration = more damage
Level 20 - Mindflay (1/1) Movement slowed by 50% and nice damage with this ability
Levels 21-25 - Improved Mind Blast (5/5)
Levels 26-27 - Shadow Reach (2/2)
Levels 28-29 - Improved Psychic Scream (2/2)
Level 30 - Vampiric Embrace (1/1)
Levels 31-32 - Improved Vampiric Embrace (2/2)
Levels 33-35 - Focused Mind (3/3) Mind spells cost 15% less to cast
Levels 36-39 - Darkness (4/5)
Level 40 - Shadowform (1/1) 15% added shadow damage, 15% physical damage reduced, and the cool see through body effect.
Level 41 - Darkness (5/5)
Levels 42-46 - Shadow Power (5/5)
Levels 47-51 - Misery (5/5)
Level 52 - Vampiric Touch (1/1)

After 52 you should start working up the discipline tree.

Here's a great priest talent guide

As a holy priest all your going to do is buff and heal for raiding and instances. As a holy priest you become one of the best healers end game which is what a lot of raiding guilds want. Here's the build for the holy priest:

Levels 10-11 - Healing Focus (2/2)Great when you really need to heal but have a mob hitting on you. Can save your life or a party members life.
Levels 12-16 - Holy Specialization (5/5)
Levels 17-21 - Divine Fury (5/5)Faster heals is always nice
Level 22 - Holy Nova (1/1)Deals damage around caster and heals all party members around caster
Levels 23-25 - Improved Renew (3/3)
Levels 26-28 - Inspiration (3/3)
Levels 29-33 - Wand Specialization (5/5)
Levels 34-35 - Improved Power Word: Fortitude (2/2)
Levels 36-38 - Improved Power Word: Shield (3/3)
Level 39 - Inner Focus (1/1)
Levels 40-42 - Meditation (3/3)
Levels 43-44 - Holy Reach (2/2)
Level 45 - Spirit of Redemption (1/1)Keep healing after your dead
Levels 46-50 - Spiritual Guidance (5/5)
Levels 51-55 - Spiritual Healing (5/5)
Levels 56-58 - Holy Concentration (3/3)
Levels 59-63 - Empowered Healing (5/5)
Level 64 - Circle of Healing (1/1)

After 64 keep going furthur into the discipline tree.

Here's a great priest talent guide

With this talent build you can be efficient for whatever you doing. This is great for a new player that wants to experience everything in World Of Warcraft without having to pay gold to re-spec for each encounter. Follow this build by the levels. Its important that you stick to this guide by level because certain skills help at certain levels. Here's the build:

Levels 10-14 - Spirit Tap (5/5)
Levels 15-19 - Improved Shadow Word Pain (2/2) and Shadow Focus (3/5)
Level 20 - Mindflay (1/1)
Levels 21-25 - Improved Mind Blast (5/5)
Levels 26-30 - Wand Specialization (5/5)25% more damage without any mana.
Levels 31-32 - Improved Power Word: Fortitude (2/2)Increases the effect of your fortitude spells by 30%
Levels 33-35 - Improved Power Word: Shield (3/3)15% more damage absorbed by your shield spells.
Level 36 - Inner Focus (1/1)
Levels 37-38 - Healing Focus (2/2)
Levels 39-43 - Holy Specialization (5/5)
Levels 44-46 - Improved Renew (3/3)
Level 47 - Holy Nova (1/1)
Levels 48-50 - Meditation (3/3)
Level 51 - Martyrdom (1/2)
Levels 52-56 - Mental Agility (5/5)
Level 57 - Divine Spirit (1/1)
Levels 58-59 - Improved Divine Spirit (2/2)
(You can choose to build up any of the three specs now, I usually go with Discipline to reach Power Infusion, but just as well you could go for Spirit of Redemption, or the Tier 5 Shadow talents)
Levels 60-64 - Mental Strength (5/5)
Levels 65-66 - Force of Will (2/5)
Level 67 - Power Infusion (1/1)
Levels 68-70 Force of Will (5/5)

Here's a great priest talent guide

38 Holy / 23 Discipline

HOLY TREE

Holy Specialization (5/5)
Improved Renew (3/3)
Healing Focus (2/2)
Divine Fury (5/5)
Inspiration (3/3)
Improved Healing (3/3)
Spiritual Guidanace (5/5)
Spirit Redemption (1/1)
Spiritual Healing (5/5)
Holy Concentration (3/3)
Empowered Healing (3/5)

DISCIPLINE TREE

Unbreakable Will (5/5)
Silent Resolve (4/5)
Improved Power Word: Fortitude (2/2)
Meditation (3/3)
Inner Focus (1/1)
Mental Agility (5/5)
Divine Spirit (1/1)
Improved Divine Spirit (2/2)

A good talent build can really help make your priest a lot better but there's more than just talents to making a good character. PvP, raiding, soloing, and grouping techniques all come into play. Along with the right gear. Learn it all from this great priest guide

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