Question

Hi, I'm doing a poem for a literature book called Red Sky In the Morning by Elizabeth Laird. The theme that my teacher assigned to me is'Anna's love for Ben'. It can be through her thoughts, words, actions or what other characters say about her love towards her brother, Ben. I am supposed to use two literature techniques, 1 from imagery (e.g. Simile) and 1 from Sound (e.g. Rhyme) however, I do not know where to start as I've never written a poem before. please help thanks!