good luck! But fair warning you're gonna be pretty hungry at only 1000 calories. 1200 oughta be okay. Also, be sure to eat some protein at every meal. Your body burns a lot of calories trying to digest protein plus it keeps you full longer.
Just remember, some calories are better than others. For example, it'd be easier to lose weight eating 1200 calories of veggies than 1200 calories of candy.