First of all don't worry about calories, maintaining a high metabolism makes it easier to burn fat. Its not about burning more than you eat, its impossible. I stick to 3 sqaure meals a day packed with plenty of protein, foods which are good for burning fat such as: eggs, fish, nuts etc. I avoid saturated fats and sugars. But never limit yourself, if you fancy a snack or an 'unhealthy' meal do it, its all about balance.
I've also found the best workouts for burning fat are HIIT workouts (High, Intensity, Interval, Training). I personally get bored of a tredmill so this is a great way to mix it up. Also it allows you to target particular areas of your body.
If you're looking for workouts try the FiiT app. I've just signed up for the premimum membership, its amazing! But you can get loads of free workouts and training plans. For a diet plan I follow Joe Wicks, his books offer an insight on what to eat on workout days and rest days to continously burn that fat.
Hope this helps,