One of the most difficult parts of any writing assignment is how to get started.
A famous writer called Graham Greene had a good way of overcoming this problem. When he finished his writing for the day, he always ended in the middle of a sentence. That made it easier for him to get started again the next day as he could just pick up from where he had finished the previous night.
You often have a title to start you off. You can think of the title from different viewpoints. Remember that in English words can often have different meanings. Here are some examples.
Suppose the title is The Fall. Start by thinking of all the different ways in which you could interpret this title. It might be a literal interpretation - someone physically falls down. So jot down a list of all the situations in which someone might have a fall of some kind: from a rope whilst rock-climbing; down the stairs; while performing in a gymnastics display; on a football field; off the harbour wall and into the water and so on.
Next, think of other ways in which you could interpret this title. These are metaphorical, rather than literal, interpretations. You can fall in love with someone - or indeed fall out of love with someone; a successful businessman goes bust; a sportswoman has her winning streak snapped and falls from her top position in the sport. You might be a teacher's favourite and then you do something which causes you to fall from this position.
You now no longer have a blank sheet of paper in front of you: it is filled with ideas. You can now select one of those ideas and give it a shape.
Most stories start with some kind of problem or conflict. If there is no problem or no issue to resolve, then usually there is no story to tell.