macro and targeting help pleaseFollow

I think I have overloaded myself reading so many threads and now have everything so confused that I don't know if I'm coming or going. I am really slow manually deciding to AOE a spell or not, and keep getting beat on while I'm still thinking/looking where to click.

So a few noob questions: Do I need separate macros for each spell, depending on if i want AOE or single target? What does the /br macro commands do? Do I have to have a conjurer macro that lists all the spells first -- and for everyjob that I decide to level?

And, tied into all these macro questions is one about targeting. I have auto lock target selected, but everytime I hit a mob, i have to reselect it to target, can this be modified with a macro? I tried using a controller pad, but it would work fine until i got to a mob and then the buttons would remap to something different than what I had setup, so now trying to do everything via keyboard controls.

Any help is greatly appreciated. Thanks!