mark Twain and "Adventures of Huckleberry Finn"

I am writing an essay on mark Twain and "Adventures of Huckleberry Finn" and I need to write on how Mark Twains life experiences influenced certain parts of the book. I need a quote from each of the sections to prove this. Any help would be great. I already used all the quotes from the book I'm allowed now I need to use articles, etc. Here is the sections. I need quotes that prove that something in twains life influenced him to write about a certain thing in the book and quotes that provide evidence that my statement is the truth.

Characters
Pap
Huck
Jim

Themes
bonds of friendship
truth (lieing can end up bad)
danger of alcohalism

Race Relations
similar origins (Huck and Jim)
positive outlook on everything/enjoy each other (Huck and Jim)
black society needs help from whites

Thanks, ty

http://www.marktwainproject.org/