New and Dual boxing

I just started dual boxing recently because of the whole recruit a friend perqs. My friend and I are splitting the lvling so we dont have to slave away. Right now I run the 2 wow programs and just tile the windows vertically. I am wodnering though how I can just focus on the main character and not ever have to switch to the secondary to have to kill stuff. So If I go in to kill something the secondary automatically assists me and starts casting without me pushing a button on that wow window. I do have macros set up but I am also seeing guys that are mounting 5 characters at the same time and killing stuff all at the same time. I really dont know how any of it works so I was hoping I could get some advice. thank you.

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