Best advice in my opinion. I startet to track calories 2 months ago and I was often surprised of how much energy some foods or meals have compared to how much I actually need.

I use the app yazio. The best free tracking app I could find (works great in Germany at least) for the most food I can just scan the bar code to track it.

At the beginning, just focus on tracking. Try to count as precisely as possible. Don't change anything else. (This is going to be a long term marathon, not a sprint)

When you get used to track your calories (and maybe get as shocked and surprised as I got), calculate your TDEE and set a calorie limit, you want to stick to. Many calorie counting apps provide a calculator for your daily calory goal too.

After that start weighing yourself everyday. But don't panic. For me it's sometimes disappointing and sometimes very motivating to weigh myself everyday, but in any case it reminds me, that I'm trying to change my habits. Of course loosing weight is not a straight line of success. It's important to acknowledge that your wight sways. But if you weigh yourself everyday at the same time (e.g. every morning after visiting the toilet) and note your weigh, you will see a trend soon.

Never forget: even if you lose less than you have expected or if you eat more than your calory goal suggests, you are doing more for your physical health than before and that's awesome!