First, you need to know what type of article you plan to write. You have several basic choices: a straight news story, a feature, or an editorial. Each has different requirements.
If it is straight news, then think of an inverted pyramid. Include more information the the beginning and answer who, what, where, why, when, and how in the first several sentences. Do not express an opnion - just tell what happened.
If it is a feature, then you can expand on a description more, but establish your focus or main point, and then support it with details. Use quotes, facts, and observations to show the story, but still, do not use your opinion.
For editorials, you should express your opinion. This of it as an argument and that someone asks you why you feel that way. Then think of answering with several thorough reasons.
News writing can be fun if you start out with a clear idea of what type of article you are going to write.
Best of luck with your writing!