I would focus more on HP/spelldmg and less on massive shieldblock (around 400-500 is OK). Some Tier5 pieces, devilshark, neck from Netherstorm Q, some stamina trinkets, block rating/sta rings are examples of good starting gear for Hyjal.
Only two things could kill you there, Abominations and shadowbolts from necromancers, rest is just.. trash.
Abomination - don't try to tank more than 3 at once at the beginning. Your healers should get used to their spike dmg. Normally they hit for ~1300 but they do nasty knockback thingy = no dodge/parry which could result in nice 10k spike during 1 second. The better your gear will be and the more confident your healers become, the more abomis you can tank at once.
Necromancer - they do 3k shadowbolts every second. Imagine you've just got 10k spike from abomi and 3 shadowbolts are incoming. Bad. If shit hits the fan you have a Divine shield for a reason. Some hunter might die, but well, that's how food chain works :)
I would recommend you to use following strategy for Rage waves:
- wave 1-3 just spam Consecration on CD and tell mages to use arcane exlosions = 4000DPS
- wave 4-5 ask your protection warrior to stand in front of the raid(at gates) and spellreflect incoming shadowbolts. Pickup spiders and ghouls and do same as for wave 1-3
- wave 6, stay far away in front, use Consecration and run back. Initial tick will point mobs to you. Now priests have like 6 second to land shackes. You can ask warriors/druids to pick some abomis. You should end with 3 abomi and all ghouls on you close to the hill with ranged dwarfs and priests.
- wave 7 is the hardest. Burn bloodlusts. Same as above just there will be 4 necromances with 3k shadowbolts every second. Spellreflect, sheeps, interrupting. Start to gather mobs soon because you need single target DPS on necromancers and AoE abomi and ghouls before another wave come.
- wave 8 is easy as there are just 2 abomi and 2 necros, rest just AoE...
When we are farming Hyjal for rep/epaxes(with 15 people) I tank alone all 8 waves before Rage again and again, it's 100% doable, so be confident and make small steps (and tell whiners to stfu in case you do something wrong). Once on farm, they won't go Hyjal without you, believe me :)
_________________
Fiorina / <Black Division> / EU-Drak'Thul
http://eu.wowarmory.com/character-sheet.xml?r=Drak%27thul&n=Fiorina