How Much Power do I need to give to these Servos?
One thing to note is that the linear servos you linked are unusual in that they are designed to run on a 1S lipo (3.2 to 4.2v). Most servos are designed to run on 5v, which is simpler if you want to use anything besides a lipo to run the servo.

The servos, and servo controller you linked should be compatible. You'll additionally need a power supply that can supply between 3.2 and 4.2 volts. Either a simple lipo (you'll also need a charger), or a wall wart like this one. If you go with a wall wart, you'll have to cut the end off and solder a servo connector onto it so that you can plug it into your servo controller.