Hiya Pinky, welcome!

Yes, definitely buy the book. If you want to do Atkins, Dr Atkins New Diet Revolution (DANDR) is the one you want. It's about $21, but well worth the money. I frequently refer back to mine. Yes, a lot of the info is on the net, but we are not always online. It's also a whole lot quicker to just look something up in the index than to trawl through a website or two.

In DANDR, Dr A explains exactly what you can and can't eat during Induction. You can either go by what he "prescribes" or you can also count carbs.

Do you know about www.fitday.com ? In case you don’t, it's a free site where you can keep track of your carbs, calories, fat etc.
This thread Fitday.com How To's gives some hints on making it a bit easier to use.

All the best to you, Pinky!

Rosebud