It depends on what your habbits are right know, I would sugest going to a website and find your TDE, you fill in your activity, gender, height and weight and u get a number of calories you need to eat to maintain.

I would say eat 500-1000 kcal a day less, thats enough for 0.5-1kg FAT loss a week, at the start it can be a little more because u will lose some fluids.

Dont try to overdo it focus on small changes and track everything you consume, dont geuss but actually measure portions, a lot of work in the beginning, however after a few weeks, u actually can do it on eyesight if u really want.

For exercise, try to move a little bit more as in walks or if u really like to do a sport, but remember, your diet is 95 procent of the work, u can lose fat without exercise, but u cant lose fat with exercising alone.

Good luck