Poems can be difficult but can be made easier when you use a theme. Pick something you have, like or know a lot about. Pet, colour, food etc.
(Choosing a more abstract idea such as a colour can improve the poem a lot).
Use language that corresponds to all the senses, touch, taste, smell, sound and sight or at least 3. For example - blue - sky, sea and blueberries, yellow - sun, chicks and lemons or hamster - sawdust, soft and squeaks.
Rhyme scheme - ABAB CDCD etc, AABB CCDD or ABBA CDDC, pick an easy one and write down all the words that rhyme first with what you want, or use a website to find them
Be fancy with your words but not too fancy - use a thesaurus or just ask someone
I’m happy to help further if you need it, it would also be handy to know what year/grade you are in! Xx