Help, pretty please?

First off, I would like to say hey! I'm Nacole (I know it says I'm Krista, that's my first name) and I am 18 years old. I... have always had a weight problem. And I've been criticized for it all throughout my life. For those that didn't see my comment in the cup size question, I am a 40G... Also, I am 220 pounds. I really want to lose weight - I simply despise watching stretch marks slowly claim my stomach, sides, and thighs. I want to lose weight somewhat desperately, and I need help. Are there any specific programs you may have used, dietary tips, pros and cons? Any and all help will be greatly appreciated... Thanks <3