Mages for Dummies Options

[SpasticTeapot]

Since I'm the only one in the group with even a pathetic grasp of the SR4 system, I figure that playing a basic combat character should be left to someone else. Instead, I figure I'll take a crack at the specialist of splash damage, the mage. I only played one for a bit in a demo, but I must say that it was a hoot being able to take out an entire squad of gangers - intended to delay our entire party - with a minor distraction and a heavy-duty stun spell.

I am not, however, too familiar with the rules. I'm very keen on the firepower end of magic, but having a high charisma would be a major bonus, especially if we can't find someone to play a face - hence, an elf shaman seems like the way to go. Can anyone make some recommendations for an effective, balanced mage build?