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Lighting is most important, okay. Lots of light, too. Hm. No flash, though, as it throws the wrong kind of light (well, the flash never flattered me, anyway).
Kinda wish I could get a studio to do this. :}
I don't like flash either (I don't even own one). The problem with most flashes is that they are mounted on the camera, which means the flash it going to be aimed right at your subject - in your case, right at you. Unless you diffuse that light, it will not only leave a bright spot on your skin in the resulting photo, but it will make your face flat and somewhat featureless. Flashes mounted to the side are far better, but also more expensive.
If there are a lot of windows in your bedroom, you can possibly get enough light (but not direct light) in your room to get a good photo, and the quality of the light would be superior to artificial lighting. You will probably still need to shoot with a relatively wide aperture, but you might want to do that anyway to isolate yourself from the background. If you hold perfectly still, you can get away with a longer shutter speed as well.
I could probably give you even more advice, but it would honestly depend on what exactly you were going for.