OP, a very easy way to start eating a healthier way is to look at the way you fill your plate or bowl.
Breakfast, try porridge. Not an easy packeted one, just real oats in milk of choice and/or water. Short of time in a morning, soak it the night before. no excuses, it's easy and it fills you up.
Lunch, Take a dinner plate. Add half a plateful of veg, one quarter of the plate protein and the controversy lies in the remaining quarter, some say carbs, others say fat, some say starch, others say grains.
Just for now, choose the half plate veg, quarter protein and make the other quarter something you like to eat.
Dinner, do the same as lunch but with different varieties of veg, protein and the other quarter.
Get at least 30 minutes outside in the fresh air every day.
Do that for a month. Review how you feel. More energy? Feel better in yourself? Less lethargic? Ready to start walking as a gentle form of exercise? Once you've got into eating good food, then you can mess around with the starch/fat/grains and initially gentle exercise.
It's really not difficult, don't put obstacles in your own way. 