Hi
Like the heading; 'Story Poems' are just that. A little bit like reading a short story but all the sentences rhyme either with each other or every second and fourth line and so on dependent on rhyming style used.
Usually Story Poems run into generally 50 lines or more. However shorter ones are suitable so long as a story is told.
Don't worry if you err as I can soon put your work in the right forum if not really meant for here.
Regards
Retro