Amanda
I don't know if you have the book (if not try to get it. Its the most important tool!) If you don't have the book yet try checking out the website until you can buy the book

Here are the Rules for Induction
http://atkins.com/Archive/2001/12/15-325810.html

Here are the acceptable foods for induction
http://atkins.com/Archive/2001/12/15-464579.html

There is plenty of other useful information on the site... but the book is MUCH better for you

Here is one of many online BMR calculators
BMR - Calorie Needs
Realize that these are only estimates.

I wish you the best of luck!