Control 5 servos at the same time (external power supply) :0

This is how I would do it.
5 servo, 5 pot algorithm

declare and assign array of 5 servo pins
declare and assign array of 5 pot pins
declare array of 5 servos

in setup

loop through 5
attach each servos
set each pot pins as inputs

in loop

loop through 5
read a pot
servo.write the mapped pot value

But seriously, start out with the knob tutorial.