Hi Tanya, I would second what forever said about proportions of food and using myfitnesspal. It will educate you along the way about what is what calorie wise and also a great motivator for getting off your bum...it is so satisfying to see a calorie deduction when you log a workout
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As a general approach I would advise generally trying to eat things as close to their natural state as possible, ie not processed. This would immediately cut out or reduce things like ready meals, white starchy carbs like pasta and bread, lots of breakfast cereals (with exception of porridge). This is where lots of hidden sugar, salt and fat lies. Second, try and make sure you eat lean protein with every snack or meal - chicken, fish, eggs for example. Protein fills you up more than any other food type and your body has to work harder to process it, so burns more calories.
Next focus on veg rather than fruit, because there is a lot of sugar in fruit, although an apple is obviously a better choice than a biscuit, it's not as good as a plate of crudités
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Don't put the focus on eliminating fat, but choose the 'good' ones, olive oil, raw nuts, avocado, oily fish for example and be careful with portions..a spray of olive oil to cook and no more than a palmful of raw nuts a day. Just because they are good, doesn't make them calorie free!
I also second forever's view about treats, if you're not to feel like you're depriving yourself you need something each day, maybe a skinny latte with sugar, a few squares of dark chocolate or a small glass of wine perhaps?
Re exercise, aim for 30 mins a day and hopefully you will manage 5 days a week successfully. Be sure to include resistance/weight training, by building stronger muscles you will get a body that looks great and burns more calories.
Good luck, let us know how you get on
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