One thing I always think of is if I start eating fewer calories to stimulate rapid weight loss, then my body will adjust to those calories, and I'll have to keep going lower and lower. I don't want to have to maintain my weight loss like that.
A person who is significantly heavier needs to eat more calories just to maintain their weight. Lowering that maintenance level of calories by 7000 a week should, in theory, result in a 2 lb. weight loss, which is a good way to start. There are a bunch of online calculators that will give you maintenance calorie numbers for your weight/age/metabolism. Start by getting that maintenance number, then reducing the number so that you will lose 1-2 lbs. a week. If you find you aren't losing that 1-2 lbs., you can lower the number of calories or increase your exercise.
One reason I like to exercise is that I get to eat more.
Try to incorporate exercise in your program, especially weight training. Weight training has a lot of great benefits including increased fat burning and making you look great in clothes. Recently I've stalled on my weight loss, but people keep asking me if I've lost weight, and my clothes are looser. That's what weight training does for me.
Much success on your journey!