how many calories to burn per day

The main page will help you, you should go to goals. If it is available, select change goals. Once you put in your information (height, weight, target weight, exercise per day etc) it will give you an estimate based on your estimated metabolic rate. It will tell you how much any calories you should bring in to maintain weight, and how many to burn to start losing. It's a good place to start.

Besides that, I don't have enough information to help you guess.