As everyone else said (and I leveled all my alts as tanks if possible):
1. round stuff up - at least 3 mobs per pull, to be efficient; take more if you feel you can handle it
2. make VERY liberal use of brews to proc Special Delivery - I NEVER ran out of them while questing
3. abuse Dave (the statue) if you took that talent; have him ALWAYS out
4. abuse Leg Sweep if you took that talent instead, to make even larger pulls and avoid even more dmg (I usually used Exploding Keg on one pull, then Leg Sweep on the other, etc.)
5. don't take talents for leveling that you won't use later - get used to your talents and their usage (limits, possibilities, issues) while leveling, saving you the wipes later
(I'm looking at you, Dave - pulling sh*t through the roof, floor and whatnot)
Enjoy your face smashing, chilli breathing alcoholic.