The huge shadow you mention will be create as the light source is small relative to the subject. Changing the angle will only move the shadow, not soften it. Things to consider when controlling shadows:
size of light source: the larger the softer the shadow transition. The smaller the harder the transition
intensity of light source (power),
angle - to control where the shadow falls
light to subject distance - which affects relative size of light source to subject)
subject to background distance - to stop unintentionally lighting things you don't want to light
There are many tools to help you achieve these, but you need to understand what light is, and how it behaves. Strobist website as mentioned will help you. Also, Light Science and Magic is a fantastic book to make you understand light. Welcome to the world of lighting. It's an interesting place!