Post by Magnerz
You can prot AoE grind as soon as you get a sheild spike + ret aura, but its best to wait until level 30 until you get BoSanctuary, the amount of mana returned goes up noticeably.
Talent as follows (imo-may be some minor alterations due to personal preference)
5/5 Divine Strength - Increasing Str is good for Blocking (Mitigation), and AP boosting (thus upping consecration dmg (amongst others)
5/5 Anticipation - Avoidance, nuff said
3/3 Imp Righteous Fury - Mitigation, key part of AoE leving
5/5 Toughness - Mitigation, see above :)
2/2 Guardians Favour - Lower CD on Hand of Protection --> more band-aid time :)
1/1 BoSanctuary - THE blessing to have to AoE Level/tank, mitigation+mana returned
5/5 Reckoning - more proc's on seal of light/wisdom, less downtime in between pulls
2/2 Sacred Duty - Extra Hp, gogo pull extra mobs :)
2/5 One Handed Weapon Specialisation - extra dmg, pretty self-explanatory here
1/1 Holy Shield - you'll notice a big boost n the ease of prot leveling from here - a must have
5/5 One Handed Weapon Specialisation - Fill up the rest of this talent
1/3 Improved Hammer of Justice - handy vs. Casters (the bane of AoE Tanking) - also most sensible filler
3/3 Redoubt - extra dmg returned (more blocks) + mitigation
2/3 Combat Expertise - Stam + 'more' hits (and thus seal procs)
1/1 Avengers Sheild - Ease up pulling + wicked for instancing
3/3 Touched by the Light - Dmg increase
3/3 Combat Expertise - Fill it up :)
3/3 Sheild of the Templar - Mitigation + damage
2/2 Guarded by the Light - Mitigation vs Casters + Mana conservation
1/1 Hammer of the Righteous - Damage
5/5 Deflection - Avoidance + Mana return (BoSanc)
Talent tree will end up looking like this:
http://www.wowhead.com/?talent=sZ0xiAzzgtcIRhox and takes you all the way up to level 65.
The only possible change to be made to this is to fill up Argent Defender for when things get hairy, but you have 2x Bubbles & Bandage (so one always off CD) and LOH so you shouldn't really be dropping below the 35% boundary all that much. Carrying round some pots HP/Manacan also help a lot, nothing worse than getting all 10 mobs beating on you down to 5% Hp and then dying :((
Enjoy :)