M.R.
Trust me, I do not mean to be condescending whatsoever with this suggestion, but one of the best sources would be the book Diabetes for Dummies. I have the weight training, fitness, and nutrition for dummies books and love them. While I have not read the diabetes one, I can only imagine it is written similarly which would make it a fantastic resource. The books are packed full of a lot of valuable information but presented in a sensible sequence and easy to understand.
Other easy, basic tips:
-Eat small meals every 2-3 hours to keep blood sugar nice and consistent in the body (avoiding highs and lows).
-Shop the perimeter of the grocery store, stocking up mostly on food found in it's most natural form (fruits, veggies, lean/low-fat meats, low-fat dairy products, etc.).
-Processed foods are junk and not helpful in helping control your blood sugar. They are usually high in refined sugars - these will enter the bloodstream quickly and violently, giving you a sugar high. Some of the sugar is managed by insulin but the rest of the sugar either remains in the bloodstream (making you feel sluggish) or gets sent to storage and converted to fat. Additionally, refined sugars and processed foods typically do not make you feel full and keep you satisfied which is why you may want to eat more food sooner to usual.
-Carbs should NEVER be off-limits, but focus on complex carbohydrates, particularly those high in dietary fiber. Your body does need sugar, but the sugar in complex carbs is released gradually and more slowly than refined/simple sugars and your body can better manage them. Also, complex carbs make you feel fuller for longer and you avoid the eat/crash/eat/crash cycle.
-Try to include exercise daily even if it is just starting with a 10 minute walk around the block. Slowly work up to a 30 minute block of time.
Good luck to you!