Definition: The basic building block of a poem is a verse known as a stanza. A stanza is a grouping of lines related to the same thought or topic, similar to a paragraph in prose.
You can also have different patterns in a poem that make up the stanza.
A light shinning in through a glass, or a car window, or a window! Make sure you add color to make it pop :) You could use a flashlight as well, or the light on a cellphone.
The interesting answer to this question is that almost all authors do write short stories to begin with. If you are interested more, investigate Roald Dahl's short stories. He started as a journalist in the second world war.