Laughing, they went home and had ice cream from the refrigerator. The story above has no beginning, so it doesn't make much sense. It doesn't have much of an ending either. It's a story because it tells about something, but it's a pretty silly one. All good stories have a beginning, a middle and an end.
Some stories even end up in the same place they started.
During the course of the story, Tom travels all over the place and has all kinds of adventures, and ends up back at home. So, before you begin to write, sit and think for a little while about the beginning, middle and end of your story. Every story starts with a main character. It can be an animal, a person, or a thing. It can be anything you want.