The first thing to do is stop and think. Do not start writing until you have a plan
You've gathered the information, done the reporting. You've interviewed all the people involved, the eye witnesses to the explosion, the police, etc, etc. And now you have to write the story. You have pages in your notebook of facts, observations, quotes. You may have some agency copy, some material from other media. The first thing to do is stop and think. Do not start writing until you have a plan. Read through all your notes, marking the most important pieces of information and the quotes you want to use. The information you have gathered will not have entered your notebook in order of importance. You need to decide what is more important, what is less important, to establish a hierarchy of pieces of information. And this is where you must think about your audience. Not necessarily what interests you most, but what will interest them. It may not be the same thing, and this is where knowing, having a feeling for, understanding your audience is so important. As you stare at the blank screen try to imagine the reader.
To read more: https://www.theguardian.com/books/2008/sep/25/writing.journalism.news