1.) You can't go wrong with Textar, ATE, Teves, or Pagid pads. They are OEM.

2.) A hammer and a punch for removing the brake pad retaining pins, and something to compress the piston with. A large pair of pliers works. So does a big flat-head screwdriver.

3.) One wear sensor per front wheel.

4.) As for parking brake maintenance, do you have sufficient tension in the pedal? Does the car hold itself when parked on an incline? If so, your parking brake is probably fine.

5.) Don't get MB rotors turned. Replace them if they need replacing. Do you have any vibration in the steering wheel when braking? If not, they're probably okay.

Don't forget some anti-squeal paste to put on the back of the pads!