I am triple boxing now just have not had the time to update this at all 10-14 xp off games have taken a good amount of my free time as recruiting is a major roll in all of it.
I use isboxer there is a 7 day free trial you can request to a email that i did, i only had enough knowledge to use like 40% of its power during the 7 days but then i just had to buy it. Now i feel i have around a 90% understanding of what i'm doing.
Things you should really have to be great at multiboxing.
-played wow over 5+ years
-have stuck with a class all the way to endgame and done a fair amount (Most useful if its the class you are going to box)
-achieved a collection of pvp achievements on a single character for the battlegrounds you will be preforming in.
-Know how to use macros/key-binds/scroll clicking with your mouse
Otherwise i may say you could be wasting your money and be way over your head. By all means go for it though you could honostly do it never playing the game and just learning to box but you would be horrible at playing a character by itself and you would not be moving the character around your boxing with as smoothly as you would knowing your single casting time/when to move/fake casting you would be a noob to the all of the small stuff with boxing is what i am trying to say and a noob to the small stuff could mean a death and the death of a leg or arm (one of my chars im boxing) in a battle could mean the end of the game.
sorry got my med back very overly invested in everything ill stop haha.