Can someone please explain the atkins diet? (10 points)?

I need to lose 25lbs and I want to try the atkins diet. I have read all the info on their website but I still have a few questions. So what all can I eat? It says that some meats have hidden sugars in them and that I can not eat those..same as like mayo and other products with hidden sugars. How can I tell? Also, do I need to work out??? I gained about 25lbs over the past year and I've been trying n trying to lose this weight with no luck...this is my last option. I plan on losing the weight and then keeping it off by continuing to eat healthy AND working out daily. So any help with this diet "rules" would be great! thanks!