It is essential to keep in mind the sensitive nature of an interview.  To catch someone's story, you have to build trust; to build trust, you must always stay aware of the interviewee's rights and feelings about telling a story and having it published and/or used to extract information.

The Tip Sheet on Asking Good Questions, Getting Great Answers covers many of the situations you will encounter and provides you with steps to take that will ensure that you respect your interviewee's rights.

Permissions

Always let your interviewee know that you will seek his/her informed consent to conduct the interview, to edit it and to publish it.

StoryCorps has an excellent  downloadable handbook on do-it-yourself audio stories.

Another excellent handbook to download, with sample forms (my favorite resource) comes from Duke University's Indivisible Project.

Other examples of consent forms:

Indiana University's Informed Consent Form

A Selection of Forms from The Veterans' Project

Folklife Center's Release Form

Central Washington University's Collection of Forms

You will likely wish to look at all of these forms and design you own specifically for use in the Heart & Soul Storytelling Project.