One of the main tools that I'm glad that I have at the start of this journey is The Biggest Loser Calorie Counter. It's a small paper back book loaded with the nutrition info on over 5,000 food items from the grocery store and from many well known restaurants.
There are many ways I use this book. If I plan on being diligent about my calorie intake for the day, I review what I want to eat and take a quick check of the items through the book to see if my calorie intake would be over or under my goal. Some times if it looks like I'm running over I look up and down the list of similar food to see if there's something more calorie friendly.
The other ways I use the book are by taking it with me when I go out to eat, of course and also by just having it at my side when I'm cooking so that I know how much a proper portion is. It's a must have for people who want to have a quick reference guide whenever they need it.