How do i lose weight fast?!?

I am 20 yrs old and healthy. i am getting married jan 29 and want to look perfect. im not way off base but im also very self consious and would love to get int othe best shape possible. Sounds weird but ya i wanna look like a model. im 5'6'' and weigh 155. I started the atkins diet last week lost 5 lbs the first 3 days and havent lost any more since. so im wanting to excersize and all added to it but need some guidance.