Start by focusing on lean protein, good fats(check your condiments and oils and snacks) fresh RAW, fruits and veggies and products that are full fiber.
tinker with the organic, non g.m.o. and gluten/casien/peanut free things later, once youve mastered the basics. You dont want to go all in at once.
My best recommendation is to stick with fresh, mostly. fresh veggies, and fruits and fresh bread. When you tinker with the top of that food pyramid (the fats, salts, oils sweets) i have a few recommends.
Apple cider vinegar(you can make your own hot sauce, salad dressing with this)
braggs liquid aminos(soy sauce)
agave nectar(u can make your own jelly, syrups, and sweeten anything with it)
e v olive oil
ev coconut oil
vegenaise (instead of mayo)
get hot mustard (it revvs the metabolism)
sea salt
nutritional yeast (use instead of parmesan)
natural ketchup (or the regular brands that are going rogue and taking out the high fructose corn syrup)
stevia (it s sugar sub thats good for you, it comes in flavors, i add it to perreir, or water to fake a soda or koolaid)
puffed chips,
air popped popcorn,
(fage)greek yogurt, you can replace your sour cream with this.
Get spices and herbs out the wazoo that perk up flavor!, my personal faves are herbes de provence (great in anything tomato based) garam masala gives a very indian feel to potaos and stir fries, unsweetened cocoa powder, awesome in soups, chilis and things with beans.
My absoltely favorite thing i want to mention is salsa, its mixture of super foods that complement each other and absorb perfectly together, and can really add flavor where normally youd load on the salt and butter.