Don't you even THINK of dieting it off, that will only make you more miserable.
You want to lose a pound a week. That is an excellent rate many can achieve and sustain for a good while. To reach this rate you got to expend 500 kcal more than you take in.
BUT! You mustn't do this by simply eating less calories, it will work in the beginning but you're doomed to fail in the long term.
What you must do is eat healthy foods. Lots of fruits, vegetables and water. Eat a strong multivitamin/mineral preparation every day!
Then you must strive to lose those 500kcal daily through exercise. Being 330lbs, exercise for you would be things like walking, bicycle riding and swimming. Don't do those health nut workout routines: at your weight they will kill you. When you walk, you carry a 100lbs backpack of excess weight, that is enough of a load to bare.
So: eat healthy and in good portions, multiple times a day, and burn calories through exercise rather than starve yourself.
Losing 100lbs at a pound a week is a two year effort to get to 230lbs. Try to maximize your enjoyment during those two years, and focus on the long term,instead of the quick result.
If you were to go on Atkins you would lose 10-15lbs in one week, but that would almost all be water and muscle, and be one oif the most unhealthy weeks of your life. So - NO FAD DIETS!
Eat enough healthy foods, and exercise more to lose the weight.
Be strong. Carry yourself with dignity.