this an easy exercise to teach you how to control your flash and conquer your fears. doing our simple shots in your own way with your own, flashgun, will help you understand how much light you are going to get, and how powerful it will be. I believe this simple flash photography tutorial is the easy way to learn
The exercise consists of photographing the flash gun directly in action by using a wireless trigger. We can compare first hand all the power settings, and how light will be casted by the flash gun. On top of that you will visualise how wide the light cone will be by controlling the flash zoom.
I believe this is the way to go – for more details and few good deals: