Should be at least 4 in-person interviews and at least 3 of them quoted directly. You may do follow-up interviews on the phone or even over e-mail, but those should be made clear in the story and on the contact sheet.
Word count should be between 800-1,000 words.
All the normal rules on formatting, setting the scene, objectivity, no interviewing friends, etc. still apply.
Any questions, lemme know.