Losing weight and toning body?

Hello to all. I am just now able to start losing the weight I gain during my surgery and treatments. I have been ill since 09/07 and had surgery 01/14/08. I need to lose 40 lbs and tone my body. I have never had to do this before so I am new to excerising. I am eating right I know that. My doctors put me on this diet but I am looking for fast results excerise regiment. Can anyone recommend one? I need something I can do at home. I can't afford a gym for am a single mother and barely making ends meet. Please someone help me.