Welcome to the forum! Don't let it overwhelm you, you don't have to totally overhaul your entire life in a day.
I try to do the best I can. I'm a busy person that works. I would love to have the time to bake my own bread, make my own yogurt, make my own whole wheat tortillas, grind my own peanuts for natural peanut butter. I consider food like that "convenience" foods. I try to buy the healthiest possible choices - I carefully read labels and try to buy organic wherever possible.
I am able to avoid a lot of processed JUNK - like chips, candy, cookies, poptarts. I try to eat a mostly plant-based diet, so my snacks are mostly fruits and vegetables. I buy a LOT of produce
One good way to start - whenever you plan meals, try to imagine your plate divided into four sections. 1/2 should be vegetables, 1/4 should be protein, 1/4 should be healthy carbohydrate/whole grain (with a little bit of healthy fat thrown into the mix).
Last night I made one of my favorites - a home made pasta sauce (with 3 cans of organic whole tomatoes, 1 can of organic tomato paste), onions, garlic, sun dried tomatoes, fresh basil, splash of red wine, wilted spinach and a package of Morning Star farms veggie crumbles. I carefully measured 2 oz of whole wheat pasta. My plate was mostly vegetables, a little protein and a little whole grain pasta!
Definitely join CSA - it rocks.