Does anyone know of some good scripting tutorials?

There are a lot of things that i would like to do but i don't know how. My List to be specific: 1: A flashlight with battery power meter that shows up on the hud just like in this picture![alt text][1] [1]: http://www.sourcedimensions.com/uploads/images/Gallery/Nightmare_House_2/nh2c50052.jpg 2: i also would like to pick up batteries that would replenish the battery life or if you turn off the light it would recharge slowly. 3: how to make a hud.