Cybernetic Stats, And Combat involving them Options

[P.A. Master]

Hey, Dumpshock. Just got into Shadowrun recently and I find myself a fan of cybernetic characters, but one thing that I only loosely understand up to this point is the rules regarding cybernetic limbs and combat involving cybernetic limbs.

A few specific questions:
1) When firing a ranged weapon held in a cybernetic arm, do you use your character's Agility score or the arm's?
2) When calculating unarmed combat with cybernetic limbs, do you calculate the damage for it with the limb's strength or your character's? Also, for hitting with the melee attack, use your own agility or the limb's?

Thanks!