Male? Female? 2000 calorie intake a day (healthy foods, of course), minimum of 20 mins of exercise a day. (More or less, depending on your gender. I'm a woman, I try to eat 1500-2000 a day, depending on whether or not I'm spoiling myself. =P )
It's like other folks have said-everything in moderation. Should have SMALL portions of food every 4 hours (3 meals, 1-2 snacks depending on your schedule), breakfast is definitely important as it gets your metabolism up and running right when you start your day.
At first you might still seem hungry, but you will physically and mentally adapt to eating less and very likely learn to enjoy the things you are eating. You don't need to starve yourself or deny yourself the things you like, just don't eat as much and don't wait to eat until you are starving-you'll only want to eat more, faster and will very obviously overeat. Save things like cookies, ice cream, etc as a "treat", tho fruits are definitely better sweets. Cut out soda-even diet, you don't want to "drink" your calories.
As for exercise, walking is by far the easiest thing to start doing. 20 min a day will get you walking about a mile or so each day (depending on pace, of course). The biggest thing is doing it for 20 mins all at once, not just like walking around a mall and stopping to (window) shop. Once you get used to doing that, you can start doing other things like resistance training (weights, et al) and more cardio-centric activities.
Biggest hurdle is starting to do it and keep at it, once you do that you're well on your way. Good luck!