First of all, what equipment do you have and/or are you using?
DXQ is correct - almost always, the best flash is done with the flash OFF of the camera; this of course can only be done with something other than a built-in/pop-up flash, or what is commonly called a 'speedlight' or hot-shoe flash. If you have an off-camera flash ("OCF") which is made by the same company as your camera, chances are it can be wirelessly controlled by your camera. If not, inexpensive optical triggers, or more expensive radio triggers will allow you to fire this flash when it's mounted away from the camera.
OCF gives you far greater control of your light, and when combined with a reflector (even something as simple as a piece of white card stock) you can do amazing work for very little cost