I'm new here (hi all!) and am at about the same point as you.

After a whole week(!) of trying I finally have 4 additional accounts upgraded to full (no thanks to appalling support from Blizzard's billing department), and plan to make my first team tonight.

I've been giving team composition a fair amount of thought lately, and whittled the choices down to either 5 shamans or 4 shamans + 1 paladin.

I think I've finally settled on 5 shamans, mainly because it's bound to be much simpler controlling 5 of the same class. My thoughts are that, should I require a dedicated tank eventually, I can use the RaF level donation system to give me a free level 60 paladin later. And by that point I should have ironed out all the basic issues with multi-boxing, so I'll just have to work out how to control 2 different classes.Well that's the theory anyway!

I'm looking forward to getting home and trying it out!