There are many different interview techniques.
Here is a link to an article that includes some very good information on doing "qualitative" interviews.
Bates, C., Droste, C. Cuba, L., & Swingle, J. (2009, July 28). One-On-One Interviews: A Qualitative Assessment Approach. Assessment Notes. Retrieved 8/14/18
(Permission to use from the Center of Inquiry in the Liberal Arts, Wabash College)
Research Methods Knowledge Base: Interviews From the Web Center for Social Research. Trochim, William M. The Research Methods Knowledge Base, 2nd Edition.
Opdenakker, Raymond (2006, August). Advantages and Disadvantages of Four Interview Techniques in Qualitative Research [44 paragraphs]. Forum Qualitative Sozialforschung / Forum: Qualitative Social Research, 7(4), Art. 11, http://nbn-resolving.de/urn:nbn:de:0114-fqs0604118.
Sample Interview Consent/Information
Interview Consent Form (interviews audio/video recorded)
Exempt Interview Consent Information Sheet