First you consider that you are all right, I mean healthy.
Get a check up from the doctor.
Leave junk food.
Take vegetables & fruits.
Play, skip, & daily brisk walk for an hour.
Take part in home work.
Like washing, ironing, cleanliness, in the kitchen as well.
Do not use any product to lose weight.
Leave all sweets &fried food as well.
Then let me know after one month.