Camera exposrue settings generally boil down to four factors:
1. The amount of light that's available (given).
2. The "speed" of the film (given).
3. The length of time the shutter remains opened (shutter speed).
4. The aperture size when the shutter opens (F-stop).
All of these must be balanced in order to get good exposure. You could balance them yourself or have the computer in the camera do it. Considering it's digital, you could easily make adjustments after you shoot if it's too dark, but really, the thing ought to make good pictures right out of the box.
Of all the factors, I personally find the aperture size is the one I like to adjust the most. I set my camera up to automatically determine the shutter speed based on the available light and the film speed. If the calculated shutter speed is getting a bit slow, then I'll bump up the aperture size to allow more light in. The aperture size determines the how much subject matter can be in focus at one time. With a larger aperture setting, you get a shorter depth of field (meaning you can only focus on relatively equidistant objects). A smaller aperture settings gives you a larger depth of field (more things in focus). See if there's something on your camera to set it for "aperture priority" or something.