If you haven't exercised before, you should be careful to do such a big exercise, because you haven't mastered the correct exercise method, so don't be reckless.
A well-structured diet and proper exercise are enough for one day.
Reduce the intake of staple food, eat more coarse grains, eat more vegetables, eat more eggs and drink more water.
If you don't get enough calories for basal metabolism, you will easily rebound and it will be more difficult to lose fat in the future.
Don't be too hasty. Health comes first. It's not worth ruining your body.