The easiest/most logical place to begin for me is deciding what I will eat, instead of what I won’t.
I don't bring candy/treats into my house because I just don't like them very much, but I purposely don't bring in things like kettle chips or anything salty and delicious like jalapeno pretzels or full-fat extra sharp cheese because they’re so delicious and not worth the calorie bang.
That being said, I do think that it’s good to center your meals around veggies and protein sources, then think of whole grain starches as an accompaniment and not the bulk of the meal.
I love this time of year because I can make stews, soups, chili, etc and they're so delicious and can be light in calories, carbs, and fat. Whenever possible, I pre-portion before I sit down to eat. I have a lot of small Tupperware containers, so I measure, close them up, and put them away in the freezer. That way I’m not tempted to eat any extras AND I have meals that are ready for me on days that I don’t want to or don’t have the time to cook.
I love to browse recipe blogs, magazines, and cookbooks to find new recipes that I can try. I usually make 2-3 dishes on weekends, freeze them in portions, and I always have a varied selection of meals to eat during the week.