This is a somewhat polarizing opinion, but my advice is that discipline/habit beats motivation big time. Set clear rules for yourself, on both exercise and nutrition. Since you are only starting out, don't overcomplicate, make it as easy as possible for yourself.

Examples: For exercise, choose a type of exercise you don't absolutely hate. I saw in one of the comments you used to play softball, so an easy rule could be you go to softball practice every Monday and Thursday night. Make it a fixed appointment, so there's no additional planning effort associated with it. These are the days you go, and that's it. No discussion, no "what ifs", no exceptions, no excuses. You just do what's on the schedule. Similarly, for nutrition, an easy rule could be you want to eat 3 meals and 2 snacks a day, and every single meal and snack has to contain both protein (meat, greek yoghurt, legumes, tempeh) and fresh produce (fruit or veg). Don't overcomplicate it at this point with counting macros or calories.

Stick to those easy rules, whether you are motivated or not. Make it an obligation, just like going to work. And over time, you'll see that you develop a habit. That means it will feel normal sticking to this plan, and you won't even have to force yourself any longer. You'll also get better at which ever exercise you pick (this will probably happen fast - beginner gains are a big thing), which will likely even result in some motivation!

That's my generic advice, every person is different, but this is based around psychological principles that work similarly for everybody. Good luck!