I'm not certain what's happening with your mouse, I run my accounts from a macbook pro, so I'm using a slightly different setup than the PC crowd.

As far as class pairings go most people agree that ranged is easier to setup and control than melee. Melee requires extra positioning work that ranged classes just don't have to deal with.

Some suggest starting with a pair of mages or some other class (but with both characters the same class) for learning purposes while you figure out control and macro schemes.

To me a warrior with anything ranged would be a decent enough dps pair if that's your goal, though I think I'd rather have a class that can heal paired with my warrior.

I dualbox a melee pair of Arms Warrior and Enchancement Shaman and love it. Really it will come down alot to personal taste.