Maybe you do not know how to divide your story into paragraphs, so lets have a look at this.
paragraph'par?gr??f/noun - plural noun: paragraphs
a distinct section of a piece of writing, usually dealing with a single theme and indicated by a new line, indentation, or numbering.
The main reason why we use paragraphs in a written piece is to either show that a new idea or new part of the story is starting or to show when different people are speaking or having different thoughts. This makes it easier and clearer to read and limits the confusion of reading a whole piece written as one.
You will start off by writing your 'topic sentence'. This will usually be in the beginning of the paragraph and will tell the reader what the paragraph is about.
For example - If you have to write a story about your dog, you will write about different things, like what he looks like, where you got him, what does he eat, how do you care for him and why he is important to you. Each of these ideas will be a paragraph and each of them you will start off with the main sentence like for instance
My dog is a beautiful dog. He is brown but has black feet and.... etc. The next idea will then be in a new paragraph.
At the end of the paragraph you will either finish the specific topic, or a sentence that will be the introduction to the next paragraph. Like for instance.
I have to groom my dog every day and must also watch what he eats.
The feeding process of my dog is important. We buy him special food ......
Do you get the idea?
There are no specific lengths to a paragraph - if your idea is finished then you start with the next one and you can even have a paragraph that is just one line, to let your paragraphs run into one another like for instance
So lets come to a conclusion.
You cannot make every paragraph just one line long, because then you loose the effect of it.
Putting your written work in paragraphs will help with this.