Hey Gamer!
It depends on how active you are. I think you're around 18, right? So your resting metabolic rate if you are completely sedentary would be 1800 cals per day, more or less (I got this number from FitDay). But if you're exercising or are otherwise physically active, that would increase your RMR. If you are burning 2000 cals a day, and are eating 1500 cals a day, then you should be losing about a pound a month.
If you want to lose faster, I wouldn't suggest lowering your calories--I'd try to keep calories pretty close to what you are eating now (that is, not going really really high, and then really really low to try to "fix" it), but increase your exercise or activity. And then, if that doesn't work so well, you could drop to 1400 a day.
Jay