Brenda Ueland wrote the book IF YOU WANT TO WRITE: A BOOK ABOUT ART, INDEPENDENCE AND SPIRIT, one of the best works on creative process. I love her book, STRENGTH TO YOUR SWORD ARM, a collection of her astute, funny, short, packed articles from a newspaper column she wrote in her hometown. And I love her biography, ME, a title she used well before Katharine Hepburn did.
Natalie Goldberg wrote WRITING DOWN THE BONES and other great books on writing process and life and creativity.
Jessica Abel is a comics artist and storyteller who is helping lots of folks go down the creative path. Her website is here. Check it out.