It's been a long time since I took photography in school, but I believe you want a slow shutter speed. That means the shutter stays open longer and lets in as much light as possible? But yes a tripod would be a must if you're using a slow shutter speed since any slight movement of the camera will make for a blurry pic.

I guess the best thing to would be to just take lots of pics to practice. Good thing it's a digital.

I am so jealous by the way, I looked at Canon Rebels with my mom when she was looking for a camera. I so want a new digi cam...