Noobs theoretical wonderings

[Nikita]

I'd go for a disc priest which is very easy to heal with, easy to counter large splash dmg, so you can focus on dpsing on the other char! As the second char I'd go for either a mage, which gives good buffs and awesome dps, or a ele shaman for totems and good dmg! I find DPSing with a lock too hard to handle due to til many dots and rng. Ele shamans recipe; flame shock -> lava burst -> CL -> LB -> LB -> LB = win!

[alcattle]

sounds like you have a "main" now. That is good for starting new toons in need of bags and gold. It does not help leveling when you dual box RAF. You can boost a second toon, which is another way to get higher toons quickly
RAF needs 2 toons at the same about level (2-3 levels) Start with 2 of anything, or try all the classes. Some will work better then others. Many say mages work well to start, and there are guides showing you how to set them up.
I also reccomend IS boxer, easy to set up and to play quickly with as many teams as you want to set up.