What should it be powered by then?
Yes, I looked at the tutorials. I'm starting to understand the concept more.
I just need to obtain a battery that can support all of these servo motors.
How many servo motors should I be using?
My advice is to grab your Arduino and work through the simple examples on this site, such as good old Blink. Then grab a servo and a potentiometer and work through the two servo examples, namely Sweep and Knob.I really think that to start, you have to get your mind how an Arduino program hangs together and how a servo is controlled.