Noob's questions

[Zeimer]

Hi. Since I'm new to dualboxing, I have some questions that may look dumb. Please answer me noob-friendly or redirect to any noob-friendly guides.
1. What to do to send key I have pushed to two clients ( for eg. I have attack macro bound to '3' on my warrior and flash heal bound to '3' on my paladin, now when I push '3' it only uses attack macro, while paladin does nothing - I have some things set in Jamba in the Macros tab but shit doesn't work, or it's supposed to work that way? ).
2. Does playing on a private server makes any difference?

#edit
It's not like I'm priv retard but buying 5 subscriptions without trying would be stupid ;p