My advice, try to avoid fad advice! All the articles and "rules" to not eat this or that are all great ways to deprive yourself into an accidental binge session! I think the best outlook to have when changing a lifestyle is to be healthIER than you've been. You don't have to be perfect . Just make healthIER choices. More whole foods and less processed ones. Fewer "health food isle" granola bars and more apples and bananas, etc. Don't be afraid of carbs, just eat more whole grains and less refined ones. You get my point! Go with the rainbow plate idea and eat as many colors of things as you can!
Read food labels! Yogurt is something many people thinks of as healthy no matter what, but some of them have 20 grams of sugar per serving. I eat whole milk Greek yogurt with 10g sugar/serving. many ingredient lists will list sugar under 3-4 different names: sugar, corn syrup, cane sugar, sucrose/fructose. Companies do this so they can list them farther down the list.
Another great thing to do is just be mindful. Pay attention to how your food makes you feel. Do you feel light and great the next day or sluggish and tired? Use this to motivate yourself to eat well. It doesn't mean you can't get pleasure out of your food. Use food to fuel yourself and take pleasure in eating. Mindfully enjoy your food and pay attention to it when you're eating it.
If your like me and have seemingly zero will power around a bag of chips, candy, icecream: Don't buy it. Don't have it in the house. :)
Finally, don't use food as a way to reward or punish yourself. Eat what's whole and tasty. If for whatever reason you don't eat well for one meal or one day, move on.
Trying to eat better can be hard the first week or two when you're breaking an addiction to sugar or salt, but it gets easier! Be proud of yourself for starting this journey! Good luck!