Getting into print can often times be a struggle. But if it's what you want, then you should never give up. You should take their critics, fix what is wrong with your article, and try again.
Some very important tips to remember is; a story written in fiction must stay on the same plane as when you begin the story, your story must consist of a beginning, middle and end, you should have planned out a great outline for this story, and develop a biography of the main character.
The reason a story must stay on the same plane as when you started it is because the person you are writing the story for is more likely to accept it this way. If it starts in a completely made-up world, it should end the made-up world. If it starts as a family of mice acting as humans do; talking having a house and such, introducing a real life cat into the story will throw it off balance and make it not believable.
The story must have a beginning, middle and ending. The beginning of the story establishes a main character and an immediate problem or conflict. The middle develops the problem or difficulty and builds to a climax which is then resolved. The ending concludes the story's event and often times only consists of a few sentences.
Planning out your outline keeps the story alive. Most authors that do not have an outline become stuck and often times it makes the plot of the story dwindle. Most editors as well as even children can tell when the story falls flat. Make sure to outline in detail. Something else that helps to make the outline, if you become stuck, is to cluster. This is to write a word down and quickly think of words that associate with it. Whatever comes to mind. You can do this with each word you come up with as well and before you know it, you can look down and see the story forming before your eyes.
classroom quiet
^ ^
school library
^ ^

With one word you can come up with several plots. Using this one word can also help come up with how you'll start, obstacles your character will face, and how it will end.

When you begin to work on your story knowing your character helps to bring the story to life. Writing a biography of the character means you can write knowing their likes, dislikes, and personality traits to help the people reading bond with the character. It should be based more on how they feel, think, things they say, and their gestures. Writing about how they look in a article meant for a magazine takes up space for words that could be used for the problem.
As long as you plan and detail as much as you can in an outline it can help lead you toward your path to publication. And if you have problems along the way, always remember these three things; survival, love and achievement. All stories have one of these elements and looking for your can help point the way to the ending.