My best advice is to get a little tripod and read the manual.
If you have a digital camera, don't be afraid to take mulitple shots of the same scene using different settings. Experimentation is the key. After a while, you will understand
how the different settings affect the images.
Pay attention to these two things:
1. ISO (100, 200, 400 etc) determines how sensitive your 'film' will be.
2. Day/Night settings. Generally determines how much light is let in and how long
the shutter is open.