Our 7 yr old son was also diagnosed just before Christmas.
He generally eats 3 meals a day and 1-2 snacks, but each meal or snack only has a maximum of 15 carbs (this is effective/net carbs, so total carbs minus fiber). He's honeymooning, so managing his carbs this way and taking Lantus once a day has worked to keep him stable so far, but we know YDMV!
Here are the products that we can not live without!
Breads/Pasta -
Nature's Own makes a low calorie bread with only 40 calories a slice (we don't count calories, just carbs, but I mention it because it's the only way to find the right one at the grocery store!) - the Honey Wheat has 13g net carbs in 2 slices, so you can use it to make a sandwich or a half sandwich and be at 15 carbs or less.
Mission makes a low carb flour tortilla called Carb Balance. It has 6 net carbs per tortilla and they taste just like a regular wrap. I use them for sandwiches with lunch meat and cheese, to make breakfast burritos with eggs, cheese, sausage or bacon, pinwheels with cream cheese and turkey or ham, I even wrap hotdogs in them instead of using hot dog buns. They are also great for little "pizzas" - top with tomato sauce and shredded cheese and whatever other toppings, pop in the oven until cheese is melted. Oh, and they work for tacos too
!
Dreamfields makes low carb pasta - it tastes just like regular pasta and has about 5 g effective carbs per serving. I use the lowest carb tomato sauce I can find (the canned sugar free kind is the lowest, I usually add some garlic and olive oil to it to make it taste better or if I'm in a hurry, I use either Ragu No Sugar Added Tomato & Basil (8 net carbs in 1/2 cup) or Barilla Traditional (10 net carbs in 1/2 cup).
Milk -
Hood Calorie Countdown - Chocolate & 2% White - I cannot rave about this product enough. Walmart carries it, but I asked my local Publix and they've started carrying it as well. The 2% tastes just like regular milk, it's amazing and it only has about 3 g net carbs for 1 cup. The chocolate milk is creamy and delicious, seriously. My son drinks it every morning. It is way better than what the sugar free Hershey's syrup makes. It has 4 net carbs in 1 cup.
Unsweetened Almond Milk, Coconut Milk, Almond/Coconut Milk - this comes in cartons in the dairy section, I like Blue Diamond or So Delicious the best, but Silk makes varieties as well. You have to make sure that it's unsweetened, and then it's 0 to 1 carb per 1 cup serving, depending on which you get. My son doesn't like the taste of it to drink, but your's might! I use it in baking in place of milk now.
Other Snacks -
Sabra Hummus - they sell 2 oz snack containers that have 5g net carbs. I serve this with mini carrots, celery, mini crackers.
Del Monte makes 2 oz containers of guacamole that have 1 net carb each. I serve this with 2 tblsp of salsa (2 net carbs) and Tostitos Bite Size Chips (each chip has 0.7 net carbs, so about 17 chips) for 15 carbs.
Frozen Meatballs - check labels, but Publix's has 4 net carbs for 6
Babybel - my son loves these in both the regular and Mozzarella - the shape is different from a regular cheese stick and he likes to peel them open. Each is listed as having 0 carbs, but I count them as 0.5 carbs, just in case.
Cream cheese - flavored or not - filled celery sticks
Goldfish Puffs (not regular) have 0.5 net carbs for each piece, my son loves the Cheddar Bacon flavor
Simply Cheetos Puffs in White Cheddar have 0.5 net carbs for each piece
My son loves yogurt - we use either Dannon Light & Fit Greek Yogurt Blends in various flavors (9 net carbs) or Dannon Light & Fit Diabetic Friendly (3 net carbs) with cereal.
Quaker makes flavored rice mini cakes called Popped. They sell them in small individual bags that have 12 net carbs each.
Fiber One 90 Calorie Granola Bars and their various snack bars (lemon, brownie, chocolate chip, cinnamon) all taste great and have less than 15 net carbs each.
Low Carb Pizza - I make my own using this recipe -
http://yourlighterside.com/2012/02/easy-pizza-crust/
My son will not eat chicken. at. all. He has no idea there's chicken in this. He loves it. Your carb count with vary with toppings or what tomato sauce you use, but mine ends up with 3g net carbs per slice. I make a batch over the weekend, cut into slices, store in the fridge for snacks or lunch. It reheats great in the oven (I haven't tried the microwave, but I suspect it wouldn't be very crunchy that way).
I've also started baking. I've used recipes from here -
http://alldayidreamaboutfood.com for donuts, muffins, and chocolate chip cookies. Her cheese biscuits are also great for snacks and sandwiches.
Good luck in your journey. Hope this helps.