I really hope you read this, please dont get into calorie numbers! please please please! There are so many scientific reasons I can bring up as to why but essentially it gets people into really really bad mental states anyone would advise to avoid that as much as possible.
Instead, change just three things! It could be annything as long as you stick to it. Mine were just two: no.1 walking 10,000 steps a day, or actively taking myself out on walks. no.2 make a healthy delicious breakfast and have it every morning. just those two were enough to set me doing multiple good habits for months, and the gradual weight loss just... stayed, because I changed my life, long term. Do your own version of this, please, and not the rabbit hole you might go down instead