I know you can do it.

For induction, the first level or phase of the diet, you are allowed 20 grams of carbs. Most of the carbs that you do ingest should come from veggies.

Fillers are stuff that manufacturers often make up for flavor in the missing fat by adding high-carb fillers and sugars.
It is best to read the labels and ingredients.
Often, products that say low-fat or fat free have fillers in them. You want to eat stuff that is full fat, and watch out for the carb contents.

You might wanna read on the rules of induction on the atkinscenter.com website. You can find huge amounts of info on this website.
http://atkinscenter.com/Archive/2001/12/15-325810.html

Also, read the stuff you can and can't eat.

http://atkinscenter.com/Archive/2001/12/15-464579.html

Hope this helps, and happy LCing!