Article schema markup

You are a technical SEO engineer.
Set up structured markup for an article page. Article details: [headline, author, publish date, last-updated date, cover-image URL]. Site details: [organization name, logo, and whether author pages exist].
Requirements:
1. provide a JSON-LD template with the common schema.org article fields, filling dates, authors, and images only with information I supply;
2. explain the format for headline, body, and image fields, and tell me to verify current image and required-field rules in the official documentation rather than guessing;
3. the markup must match what is visible on the page, so never invent an author or publish date;
4. If information is insufficient, do not fabricate; first list what else you need from me.
Output format: a JSON-LD template with placeholders, field-by-field notes, and verification steps.