Hello Tammi,
You've gotten some great advice, but I would like to add not all natural or organic food is lower cal. or fat. We have also jumped on the making better food choices. First thing you need to start with is fast food! Its so so bad. Check out there websites first before you take your family there so you know what the best meals are on the menu for you all to eat. Dont think a salad is always the best thing, if your adding ranch and croutons and bacon bits you might as well eat a burger instead.
Ok at the book store check out the Eat this Not that books. Its great they have ones for kids, eating out, what to buy at the store.
Always check the facts on the lables. This will take time the first 10 shopping trips or so, but you will know right off hand what to get of each thing thats got the lest amount of cal and fat. The go yougurts have more cal and sugar then the dannon light ones for kids. Some cereals have more sugar then in your cup of coffee.
My son is only 3, but we make sure to give him veggies more then 20times to determine if he really likes it or not. There are certain things we dont like either, but will make anyway so he can try them. I always buy frozen, or shop at sams club and buy them in bulk. I usually go with mix veggies so there are so many to choose from with each meal.
Fruit in a bowl on the counter will help give them something to snack from. We live in an apartment so I cant leave food out due to bugs, but I will sometimes freeze it with juice as fruit popcycles.
We also keeps snacks, baked chips are 100X better then fried. Walmart or publix brand crackers are also great for tuna dips. But make sure you've compaired the lables at all stores where ever you go because they will change if the prduct is different. We also keep cookies, yes cookies, but there is a limit to how many he can have.
I personaly dont buy natural or organic as it cost 3X as much and some of it has more cal and fat then the other brands. We have also cut out red meats to only once every few weeks and buying 90% ground beef or better. Yes its more expensive but if you shop at casco's or sams its cheaper in bulk. Lots of chicken, and fish. Fish isnt as expensive as you would think, sometimes publix puts talapia on sale at $4.99 lb. We also have learned to use Mrs. Dash and lower sodium soups.
If you are soda drinkers Pepsi zero taste just like pepsi. If you dont like that, try buying coolaid sugar free and adding truvia sweetner to it. This doesnt taste like splenda, believe me I DO not like splenda and can taste it everytime.
I hope this helps, and just keep trying new things, every little low cal thing helps. We still eat out once a week at chick-fil-a or subway so you dont have to starve yourself from the good yummy foods in life =)