I had GD with my first pregnancy and used this book:
http://www.amazon.com/No-Fuss-Diabetes-Recipes-Delicious-...
It was awesome and the recipes were easy and without goofy ingredients. The book was ideal for me because the recipes were written for 1-2 servings and I was just cooking for my husband and I.
You may also wish to consult a user-friendly book like Diabetes for Dummies. Not that you're a dummy; just that it will be a quick and easy read without all the medical jargon.
From what I remember:
-Eat 5-6 smaller meals, no more than 2-3 hours apart.
-Carbs are NOT your enemy; simple carbs are. You want to avoid sugars but include whole grains and fiber.
-You typically cannot go wrong with a diet that is heavy on the fruits and vegetables.
-Shop the perimeter of the grocery store - fresh fruits, fresh veggies, low-fat dairy, lean cuts of meat, and avoid processed boxed foods that are full of junk, HFCS and sugar as they are nutritionally void
-Make sure you stay hydrated: at least 8 glasses (8 ounce) of water a day.
-If you are allowed to exercise (I wasn't and it sucked), try to walk at least 15-30 minutes a day.
Good luck to you. On the bright side, adopting a diabetic diet is actually a very healthy lifestyle choice that can benefit you well after your pregnancy. Additionally, the GD condition will likely go away shortly after you deliver and typically is not a long-term issue.