A friend of mine wants me to take photos of her two month old son and I would LOVE to but its Autumn and its so cold outside which would mean the photos would have to be taken inside...which i dread. I am not good at indoor lighting at all. I don't really have the money to go out and buy a bunch of fancy equipment nor do I even know what I would buy if I had the money. Does anyone know of any cheap lighting I can get? Or ways to use lamps etc. to achieve good lighting. I find that my photos come out somewhat blurry and off color with the regular lighting in my house. Any advice I can get would be great

Thanks!
Additional Information: My camera is a Nikon D40