Hello, here is the answers for ur exercise :
I will stop smoking → because it is not good for my lungs
I am going to start exercising → because it will make me strong and healthy
I will start saving money → because I want to buy a new car
I am going to start going to bed at 10:00 pm → because I do not want to be tired during the day
I am going to stop eating sweets → because too much sugar is bad for my teeth
I will start practicing English every day → because i want to improve my language skills
I hope I helped u a lot !