Duke Libraries offers a LibGuide as an introduction to qualitative research. The guide includes references to textbooks, experts, tips, software, and tools for collecting, managing, and analyzing non-numerical data (e.g. text, audio, video, or pictures).
This is a brief "notes from the field" blog post by Cory Owen, Ph.D. candidate in Educational Leadership at the University of Houston. While not a "definitive guide," it offers useful pointers from someone who has "been there."