Well - before reading any posts - which could confuse the HECK out of you, I would suggest that you read the book first.
You can get it really cheap on amazon (used even)...or from your local bookstore. It will be organized - concise - and exactly all you need to know.
If not - I suggest going to the atkins website - there is a wealth of information there.
The posts here are terrific, but sometimes all over the place, which I found confusing at first.
Is this your first time on Atkins?