Light soy is generally used for its salty properties and therefore seasoning, and dark soy for colour and richness. The main tip to remember when making fried rice is to cook the rice the day before and leave it to cool completely. If you try making it with freshly boiled rice the starch will become glutenous and you'll end up with a sticky mess!
Just heat a little groundnut or sunflower oil in a wok until smoking, add sliced garlic, ginger cut into julienne (matchstick) strips, and the sliced white parts of spring onions, and fry for 30 seconds. Add the rice and fry, moving it around the wok regularly, until piping hot. Season with a little light soy, a drizzle of sesame oil, black pepper and the finely sliced leftover green parts of the spring onion. Done! Be sure to heat the rice through thoroughly, though; it's a high-risk foodstuff when reheating.