I want to lose atleast 50lbs. What are the best workouts to lose weight. Not toning but cardio. I want to shed lbs. ?

Weight loss. Simply burning more calories than you take in will result in weight loss so exercise alone will not get you to your goal.
Lower caloric intake. I agree with dr rubin. The avg person can't lose significant amounts of weight with exercise alone (which is great for your health!)...But caloric intake has the biggest impact. If getting rich = losing weight, spending less/coupon clipping = exercise, while big raise = lower caloric intake.