This will blow your mind. In groups I have played a makeshift shaman like 95 % of the time. Debuffs are important for us along with DoT's and occasional nukes. Yes also our awesome buffs. But for the group here is a great setup, for pretty much everything.
Debuffs:
1. Annul Magic (dispell unwanted buffs on mobs)
2. Sha's Reprisal (player slow, mana usage: 238, pet slow = over 1k mana no thanks)
3. Incapacitate (decrease that mobs STR and AC, making it even easier to kill)
DoTs:
4. Disease DoT
5. Poison DoT
Nukes:
6. Maelstrom
7. Poison Nuke
8. Aggro Ice Nuke (in case you have to tank in a pinch, maybe keep a shield bandolier with shield block for such a pinch)
9. Roar: PBAE Ice Nuke (if facing more than one mob)
Beneficials (use as needed):
10. Feralgia (Growl and Howl spells are redundant as this one spell greys out those 2 and has both the same effects)
11. Target Heal (for backup heals)
12. Ferocity (you know the deal on this one)
Probably even good for a raid except I would switch out debuff spells for other useful ones like the misc pet buffs (pet slow, empowering warder, pet rune)
This lineup is great for every situation mostly. When it's strictly pet tanking I make changes mostly in stacking heals and delayed heals, and those other pet buffs, and swap in DoT s while watching pet kill.
Once you start getting all those fancy AA's you'll be adding more DPS too, like Bite of the Asp (for an extra DoT), Replenish Companion (panic pet heal), Gellid Claw (Hand to Hand triggered innate proc debuff that decreases HP and ATK). Use discs as needed.