Hi L.!
Healthy, local food is a topic that I am passionate about!! It IS overwhelming to change your diet--there's so much information out there. Take baby steps. Do one or two things each month to eat healthier. Think of it as a journey, not something you are going to completely accomplish in a week.
Where to start....
(1) Michael Pollan has two AMAZING books out on food. I think they should be mandatory reading for anyone that eats. ;-) They are "Omnivore's Dilemma" and "Food: An Eater's Manifesto". Both will be at your library, but there may be a waitlist. "Omnivore's Dilemma" is a long book. There were parts I skimmed over, but I can honestly say this book completely changed the way I think about food.
(2) Start shopping at Whole Foods, co-ops, and natural food stores. If you have never done so, you might just want to go once and walk around without planning to buy anything. It's going to be a very different experience than shopping at Cub or Rainbow. I see you are in Excelsior, and I'm not all that familar with that end of the metro. In Mpls, there are two great co-ops, Seward Co-op (www.seward.coop) and The Wedge (www.wedge.coop).
Some of the stuff there is going to be more expensive than what you will find at regular grocery stores, but you can pick & choose what you spend your money on. For instance, I only buy meat and dairy products that are from MN or WI and are hormone- and antibiotic-free. If I need to spend an extra dollar or two to get quality meat and keep local farms in business, so be it. We eat less meat and dairy than we used to, but I know that what we are eating is high-quality. I am less selective on other food items--you will find your own "hot button" food issues, and can work your food budget around them. My philosophy is, I either spend the money today on better food, or I will spend it tomorrow on medical expenses.
(3) Get in touch with what food is in season when. Right now, the sap is running and maple syrup farms are hopping. In a few of weeks, rhubarb will be ready to harvest. Food is at it's best when it's local and in-season. Try to incorporate seasonal food into your meal plans.
(4) Visit a farmer's market. Make sure the food is local--I know the big market in downtown Mpls has wholesalers at some booths. Two of my favorite markets are the Mill City Farmers Market and Midtown Farmers Market. You will be surprised at how inexpensive local, fresh produce is!
(5) Find a local farm that welcomes visitors and take your kids there. Let them see the chickens who lay their eggs, and the cows they get their beef from.
(6) Start cooking from scratch, at least some of the time. I grew up in a household where Hamburger Helper was the norm, so it took years for me to get where I am today--don't expect to go from convenience food to Martha Steward overnight. Cooking from scratch is not just healthy and fun, but it will save you money. I no longer buy expensive dry cereal. Instead, I make my own granola, and we eat old-fashioned oatmeal I buy in bulk at the co-op for $0.89/lb. I also make my own bread, yogurt, and kefir on a weekly basis. I can buy a pound of pinto beans for $1.50, and with a little prep work, eat off that all week long--beans & rice, burritos, honey baked beans. I have dabbled in canning and freezing produce I bought at farmers' markets last summer.
(7) Read the list of ingredients on everything you buy. Avoid high fructose corn syrup. It is in everything from bread to juice drinks to cereal to jams. HFCS is the hallmark of cheap, over-processed food, causes blood sugar to spike, and is one of the reasons for our country's Type II Diabetes epidemic. Also avoid artificial colors, preservatives, and really anything that sounds like a chemical or that you have no idea what it is.
The ingredient list is where the truth lies. Just because the front of the box says something contains 100% Vitamin C or Iron does not mean it is necessarily healthy. Do your research and know what terms like "organic" and "natural" mean. Organic junk food (chips, cookies) is still junk food.
(8) Lastly, make sure your snacks and meals are well-rounded. My rule for snacks is that they should contain 3 of the 5 food groups; meals should have at least 4, if not all 5. If you follow that simple rule most days, you will be eating healthy.
Food is exciting--it nourishes us, it's what keeps us alive. Enjoy!