The Question and Answer section for Wide Sargasso Sea is a great resource to ask questions, find answers, and discuss the novel.
I'm not sure what you mean by "parrot in the first and Antoinette in the second". Please clarify.
I can't recall the specifics of every chapter but you might check this out:
Fire in the novel represents rebellion, both political and emotional. Antoinette's dream of setting fire to Thornfield Hall in Part III reflects the ex-slaves' protest.