My question is if I get about 1000 calories a day for a month or 1200 will i loose some serious weight I am trying to drop down about 20 pounds just because it is something i have to do?

If you want to actually be able to maintain your weight loss, don't try to do it fast. You'll almost always gain it back. Aim for a goal of losing 1 to 2 pounds a week. That's a healthy weight loss. Calculate your basal metabolic rate (BMR). They have calculators online that will do this for you to help you determine how many calories your body burns each day.

Once you know your BMR, you can use that to determine how many calories you need to eat in order to lose the weight in a safe manner by using the Harris Benedict Equation.

http://www.bmi-calculator.net/bmr-calculator/

http://www.bmi-calculator.net/bmr-calculator/harris-benedict-equation/