Creative childrens story for a learn to swim story book

Hi, We are a swimming school and looking to create a learn to swim story book for young children in our swimming school program. We would like to incorporate our sea characters (learn to swim poster attached) in a fun & engaging story for young children to learn swim skills and get excited about taking their swimming lessons, and help fearful swimmers become less fearful! Short story 12 pages max (24 pages front & back max) The main swim skills that we would like incorporated into the story are: - blowing bubbles - monkey crawl or choo choo train along the pool wall - face in water and holding breath - floating on back - "super girl or boy arms" (arms straight face under water and kick to instructor) - jumping into the water and swimming back to the wall & climbing out of the pool (humpty dumpty sat on the wall, humpty dumpty had a big fall..") - retreiving an object from the bottom of the pool... few other skills that will give the contractor later would like the story to incorporate a scared swimmer who loses the fear and learns how to be a great swimmer in the end. Please let us know your creative writing experience with childrens stories and any swim teaching experience a huge plus!!! Native English speakers HIGHLY preferred