A first-time author does not automatically need every publishing service. Start with manuscript readiness, then add only the editorial, design, formatting, publishing and marketing work required for the formats and sales channels you actually plan to use.
Start with the manuscript
If the structure or content is still changing, spend on editorial development before final proofreading, formatting or cover-spine production.
Build the production stack
Once the text is stable, typical production work can include copyediting, proofreading, cover design, print layout, ebook formatting, metadata and platform setup.
Add marketing with a goal
Choose marketing activity around a defined audience, launch plan and budget instead of buying a generic promotion package.