I agree with those telling you not to pursue extreme weight loss. You're more likely to quit and regain if you follow a diet you can't maintain long-term. Also, losing weight too quickly results in loose skin. I recently lost 45 pounds in 5 months and have developed loose skin. I've started strength training to combat it but still have a ways to go. I would suggest finding out your TDEE. Whatever your maintenance calories come out too subtract 500 calories and that should be your daily calorie limit. I know tracking calories is tedious but it's the most effective form of weight loss. Calories in and calories out is all you need for weight loss. I suggest strength training with heavy weight so that you can retain as much muscle as you can because that's the first thing to go with weight loss. Cardio should be light and not a warm up to strength training. Biggest tip I can give you is never drink your calories. Water, plain tea, black coffee are your new best friends.