Poetry comes in many forms, but differs from prose in that it is written in lines, not standard paragraphs. Traditionally, poets have employed techniques such as rhyme and rhythm to help their work flow. A good example of a traditional verse form is the alternating quatrain, which consists of four lines of poetry. The first and third lines always rhyme and should contain the same number of syllables. The second and fourth lines also rhyme, creating a structure referred to as "ABAB." However, do not feel restricted or obliged to make your poetry rhyme. Also, remember that a line of poetry can break mid-sentence, so a phrase that would have amounted to one sentence of prose can make up several lines of poetry, a whole verse or even a whole poem.
Think about people or events that have evoked a strong emotion in you, whether it was love, fear, sadness, hope, boredom or amusement. Try to focus on what it was about the situation or person that caused you to feel that way. If what made you feel the sentiment is not obvious, do not worry --- writing the experience down might help you to get the the bottom of it.
As you write, think about the rhythm of the words. Imagine that you are beating a drum as you read over what you have written, and consider whether or not the drumbeat fits with the words. If there is a rhythm to your writing, it will flow better for the reader. Remember that song lyrics are essentially poems sung to background music, instead of being recited.
Think about a poem you have read that affected and stayed with you. Consider why you remember that particular poem: Did one particular line stick in your mind? Did you enjoy the clever way the poet expressed his or her feelings while making sure the poem kept rhyming? Did the rhythm of the poem keep your attention? Was a particular description of a person or a place so striking? If you have not read much poetry before, pay a visit to your local library and check out their poetry section. If you find a particular poet you like, there is nothing wrong with trying to write a poem in a similar style, as this could prove to be a great learning exercise.