I'd say its way too early to expect any such guide to exist yet.
My suggestion is to either skip those quests for now until you know you need to do them, or just do them as you go along.
They are very painful, but may be worth it if the reward is good or if it's an important chain (those are the only ones I do on my boxing teams myself).
I haven't even started questing in Northrend on my boxing team yet though, lvling my main first.

Be glad you only have 3 characters, might make the quests seem a bit less painful to think about how it would be with 5