my 2 cents:
eat little, eat often, exercise regularly.
I know people that have lost lots of kg or lbs and have been eating 3000kcal a day. The combination of what you eat, how much you eat and when you eat is key. If you stop eating, your body's metabolism will slow down and try to store every little calorie you give it for later. If you want to fuel a fire for the whole night, you don't put all the wood on at 6pm.
Carbs are not a problem, carbs give you energy. Not all carbs are created equal though. Protein is good too and fat is often overlooked but essential in a balanced diet.
On carbs, you want low GI carbs, not refined white sugar. High GI carbs are more likely to cause you to gain fat. My choice is oats. I eat lots and lots of oats. Oat based cereals in the mornings, oat flapjacks with honey and fruit and finely ground oats with my protein shake after a gym session. They are brilliant. You are going to need to exercise and if you don't have plenty of carbs you aren't going to get anywhere.
On protein, there are probably people on this board that say you don't need it, they're probably right. I take it because it helps me recover from exercise. Don't waste your money on expensive branded protein shakes though, they are usually packed full of sweeteners which will counteract what you're trying to achieve.
On fat, everyone thinks fat is bad. Truth is it is important in the building of your brain and eyes (amongst others) but it has to be good (or essential) fat. My test is if it's liquid at room temperature then it's ok. Things like olive oil, vegetable oil and nut oils are fine. Any fat which is solid is bad and should be avoided. This is generally animal fats. Cut them off the meat and minimize your intake as much as possible. Unsalted nuts are an excellent snack and full of essential fatty acids.
Ratio wise I go for 40, 30, 30 Carb protein fat but feel free to improvise for whatever is best for you.
My 6 meals a day are Breakfast, Brunch, Lunch, Linner, Dinner and Dupper. Each are around 400 - 500 calories and I try and keep them all as balanced as possible. You might want to try 300 - 350 though.
For example: Cereal with fruit and milk and protein shake followed 3 hours later by a big serving of flapjack (the english version, i remember there being a difference), lunch would be greens and chicken salad with olive oil dressing, approx 2 hours after lunch i'd hit the gym. protein and carb shake immediately after workout, dinner would involve some kind of fish or low fat meat and veg. Lots of room for experimentation I often flash stir-fry the veg in a very hot pan in light oil or have it as part of a low fat curry. Lay off the hollandaise sauce though
Whatever is left over is usually my final meal of the evening.
There is so much scope for variation in this type of diet. The important thing is to eat small portions,
you should never be full, eat often, I eat every 3 hours (even if you aren't really hungry), and exercise on a daily basis. Even if it's just for 40 minutes a day. Get into a routine and be prepared to stick with it. This won't drop kilos in days but it will be a change that will lead to a considerably healthier lifestyle.
Hope this helps and best of luck.