I'd level the Druids as Feral.

Put IWT in the DPS spam.
And use something like:

#show
/castsequence reset=combat Mangle(Cat Form), Rake(Cat Form), Mangle(Cat Form), Mangle(Cat Form), Rip(Cat Form)

That leveled faster than any other composition I've done to date.
Once you get Leader of the Pack, the crits will basically keep you healed without worrying about anything else.

You can 5x Rejuvenation (as a damage absorb, basically) if you need to.
And 5x Lifebloom is very strong healing between pulls.

You should have full mana after a pull, if you need healing.