Welcome back! Amy
Since it has been so long, you might check the Newbie Advice sticky. http://forum.lowcarber.org/forumdisplay.php?f=110 The #1 tip is Know your Plan...best to follow the exact rules of whatever low carb or Keto plan you choose to start, but you haven’t chosen a plan yet. One new website for great free advice is DietDoctor. https://www.dietdoctor.com/low-carb/keto that may help you choose a plan and carb level.
Look around this forum for other new ideas and websites, but even if you choose to follow the Atkins book you have, there is more of an emphasis on using real foods, not commercial LC products and limited sugar substitutes.
All the best,