First, you need to come up with a funny and exciting topic that you think children will like. Think back to what you found funny as a child and start from there. Add characters if you wish with simple names that rhyme and that could be used with other rhyming words. Then, think of a topic or simple scenario and add characters in and around this. Make sure everything is kept simple and easy to understand. The poem should last no more than a couple of minutes. If you do not want to write the poems yourself, you could try using the work of some famous poets.
Lewis Carroll is the very famous English author and poet renowned for creating the "Alice in Wonderland" stories. His poems are also recommended for keeping children entertained. Try "The Hunting of the Snark" and "Jabberwocky," which are available online. These are both examples of the genre of literary nonsense, much loved by children. "Beautiful Soup" is also a good poem to make children laugh.
Thomas Stearns Eliot was an English poet, born in America. His most famous and well-loved poetry includes: "Macavity - The Mystery Cat" and "Sweeney Among The Nightingales." Both favor simple rhythms that are simple and easy to understand. There are also certain aspects of the poem that will allow children to express themselves, using emotions and theatrical actions.
The "Puffin Book of Modern Children's Verse" is available from most good book shops as well as online at Amazon.com. The book is a collection of modern children's poetry and features enchanting, funny and exciting poems for every mood. Featured poets include Roald Dahl, W.B. Yeats, Benjamin Zephaniah and Laurie Lee.