Tanking as a Shaman

I'm leveling up with 2 other classes, a Priest (holy) and a Warlock (affliction). We're around the level 35 range. Finding tanks can be quite time consuming. I thought that it cool to have my Shaman tank.
I was thinking about using this spec: http://db.vanillagaming.org/?talent#hZiVbzVxk
Eventually leveling into either
1: http://db.vanillagaming.org/?talent#hgczZiVbzVxzZVcbL
or
2: http://db.vanillagaming.org/?talent#hEczocbZiVbzVxuk
The rotation is likely:
- Earth Shock and Auto Attack.
- CL for pulls
- Rockbiter + Lightning Shield buffs active at all times.
- Stength of Earth, Mana Spring and Grounding totem active.
I'm wondering about:
- How much of a must Anticipation. Is this a must talent as Enhancement tank?
- I'm seeing elemental Shamans tank. Might this be a better spec alltogether?
- I heard that healing is good for AoE threat generation. Are there certain talents that are required to make this work?
- What is a standard optimal rotation?
- Is Storm Strike worth it? It's quite taxing on mana.
- Stoneskin totem seems to be minimal gain. If the party isn't having trouble healing then Stength of Earth might be better, is my line of thinking correct?
I'm going to try Shaman tanking regardless of naysayers, even if it's a waste of time/gold. Any comments towards making a viable Shaman tanking spec for the 1-59 content are appreciated. Even if Shamans are not the most optimal tanks.
I was thinking about using this spec: http://db.vanillagaming.org/?talent#hZiVbzVxk
Eventually leveling into either
1: http://db.vanillagaming.org/?talent#hgczZiVbzVxzZVcbL
or
2: http://db.vanillagaming.org/?talent#hEczocbZiVbzVxuk
The rotation is likely:
- Earth Shock and Auto Attack.
- CL for pulls
- Rockbiter + Lightning Shield buffs active at all times.
- Stength of Earth, Mana Spring and Grounding totem active.
I'm wondering about:
- How much of a must Anticipation. Is this a must talent as Enhancement tank?
- I'm seeing elemental Shamans tank. Might this be a better spec alltogether?
- I heard that healing is good for AoE threat generation. Are there certain talents that are required to make this work?
- What is a standard optimal rotation?
- Is Storm Strike worth it? It's quite taxing on mana.
- Stoneskin totem seems to be minimal gain. If the party isn't having trouble healing then Stength of Earth might be better, is my line of thinking correct?
I'm going to try Shaman tanking regardless of naysayers, even if it's a waste of time/gold. Any comments towards making a viable Shaman tanking spec for the 1-59 content are appreciated. Even if Shamans are not the most optimal tanks.