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.