The biggest issue with low-light photography is (fairly obviously) the lack of light reaching the sensor causing underexposure (Sometimes combined with the shutter speed being set too low to try and compensate, and the photos suffering from motion-blur).

In terms of camera settings you're going to want to shoot with the aperture as wide as it'll go, although the kit lens isn't particularly fast, so I imagine that this won't be enough. Make sure the shutter speed isn't too fast, but make sure you don't suffer from motion-blur or show camera-shake. I'm not sure how well the latest xxxD/Rebel series cameras deal with medium-high ISO, but I'd increase the ISO a little, but you risk lots of noise if you increase it too much. They're the three things you can control on the camera.

To maximise the amount of light on the subject, I'd personally prefer to work as much with natural light before introducing artificial lights and flashes, using things such as reflectors. If there's really not enough natural light that can be directed at the subject, then you're going to have to use artificial sources, but try and avoid harsh shadows by softening the light by bouncing off the ceiling or off or through an umbrella.