V.,
I think it is great that you want to take control of your family's nutrition. Check to see if your health insurance will help cover the cost to see a nutritionist. They will be able to help you get an idea of what types of foods you should be eating on a daily basis and what foods you should stay away from.
Take a look at the book "Meal Patterning" by Chris Johnson. I found a copy at my local library. He has some great ideas in his book, but most importantly he has revamped the food pyramid and turned it into a food target. It shows the percentages of the types of foods you should be eating daily and then shows how healthy they are by placing them in rings in the target. Red = bad foods, orange = not-so-good foods, yellow = ok occasionally, light-green = daily foods, dark green = really good for you foods.
This target has been a great teaching tool for my 6-year-old son. When we are talking about the dinner menu for the week he will ask where the dinner ingredients are on the target. It is nice to see our progress and see how our diets have changed over time to include more green and less red foods.
Also, www.savingdinner.com is a great site for meal planning. Leanne Ely has also written many cookbooks called Saving Dinner, Saving Dinner the Low-Carb Way, Saving Dinner through the Holidays, etc. Her weekly menus and recipes include side-dishes as well as the main course recipe. Her shopping lists include lots of fresh fruits and vegetables, fresh meats, and lots of different spices to make your food taste new each time.
We love her recipes and it is rare when I duplicate a recipe once every two months or so. I can't afford the fish as much as she has in her weekly menus, so instead I use more chicken and vegetarian recipes.
I have found that even on a budget of $150 a week for the three of us, buying mostly organic foods (our son has multiple food intolerances), I usually come home with having not spent my entire budget. I even make enough of the dinner to have left-overs for lunch the next day and they are just as tasty, healthier too.
Remember, your kids are used to the sugary foods and high-fat, high-protein dinners. They may fight you and refuse to try the vegetables and complain about the healthy snacks. Just remember you are the mom and it is your job to teach them good nutrition skills, skills that will help them to make good choices in the future.
Make your changes slowly, but stand firm with the decisions you and your husband have made. Eventually your boys will adjust to the new eating style and will learn to like fruits, vegetables, and even learn to try new recipes without complaining.
The gift of good food choices and continued health down the road is one of the most precious gifts of all.
Good luck!