The following method is loosely based upon a document: Information Literacy Competency Standards for Journalism Students and Professionals.(pdf).
You can also refer to the following book from Investigative Reporters and Editors:
Houston, B., & Investigative Reporters Editors, Inc. (2009). The investigative reporter's handbook : A guide to documents, databases and techniques (5th ed. / [edited by] Brad Houston. ed.). Boston: Bedford/St. Martin's.
FIND AND ORGANIZE
EVALUATE FOR ACCURACY AND FAIRNESS
DRAFT AND CREATE
Follow professional guidlines by the SPJ, Poynter, NPPA, RNTDA and others: