I think the most important thing is for you to set up a healthy lifestyle that you can follow for the rest of your life. Is 1k calories a day realistic for that? I would start by tracking your calories (Myfitnesspal.com is a great way to do it) to see how your diet is playing into your weight loss. Everything in moderation. You don't want to end up injured from overuse and not be able to exercise at all. Slow and steady. Good luck!