Functional texts are the texts which include do-it-yourself and how to do instructions. It includes such as directories, menus, forms to fill and so forth. It is used by the reader in order to confirm for the next step and what is needed to do.
Therefore, of the following statements which describe a functional text is
The primary purpose is to provide information to perform a task.
It presents facts, principles, theories, and reasoning related to a subject
I am not sure what you are asking here. If you are asking what parallel structure looks like, you would have to keep the verb tenses the same. For example, Sam likes to ride bikes, hike trails, and bake bread. What is does NOT look like: Sam likes to ride bikes, go hiking on trails, and baked bread with her grandmother. The structure words would be based of the passage you were given, which isn't supplied here. If you were asked to write a paragraph using a parallel structure, follow the example given here.
Answer:
If your thinking about creating a book, then create a scenorio and characters in your head and just let your mind expand on its own. Get ideas from other books, study different types of characters and personalites, and there's a bunch of websites too that can generate some ideas for you :)