TREE AND SHRUBSLeaf it to me

I need help on an introduction paragraph for the book The Bean Trees?

I am writing an essay for the book The Bean Trees. Its on symbols from the book and I only need 3. I am using Ismene, the bean trees, and rhizobia. Can someone help me think of a way to write an introduction paragraph for symbols in this book?
How would I discuss the importance of the symbols in my first paragraph?

I would suggest discussing the importance of symbols to the book, overall, and then briefly discuss the thee symbols you’ve selected.