what is a good diet and exercise plan?

[Paige]

im 17 and 180-190 lbs. i really want to lose weight to be in the 140's, and i want to start now so when school starts up and ill have senior pictures i will look better and feel better.right now i walk a lot because of the school i go to, you have to walk to get to different rooms and classes. i have a horrible calorie intake, sometimes i over eat, then there's days i don't even eat enough to be over 1000 calories. i have no clue where to start and what to do, i have a plan for summer, like running at 8 n the morning when school is out and im moving all day long, and eating less, but im not sure of exactly what to eat, and i get bored with it so is there a website of healthy things to eat?, and im picky, like badly so they have to be kind of good too i guess to me. but how long should i exercise daily? is it necessary to count calories? do you have to do it no matter what? please tell me anything and everything...im getting desperate now.