Looking for a new workout

Me and my wife are looking for a good fat burning workout. I used to playn football for years and haven't worked out in four years. So I know the high intensity weight training to build muscle. I wold like to burn the fat first before I get into a high intensity workout again. We always start with cardio for 20-30 minutes. I would imagine that you have to do low weight and high reps for toning and fat loss. Any suggestions on what we should do for weight training?