The book will contain rules and adventures, some pre-made characters which make up the Wyrmling Brigade, rules for making new characters, and setting info for the town and valley of Dragonsdale where the adventures are set. The rules are divided into "Basic Rules" and "Advanced Rules", which provide additional mechanics to increase the complexity of the game and provide more mechanical differentiation between characters via Talents - special abilities and boosts to the wyrmlings' capabilities.
The rules will be presented over the course of two pre-written adventures designed to get new players started immediately without needing to read through pages of content. That said, the rules will also be corralled into a chapter or two of their own in case you want to read them over without narrative surrounding them - or want to easily reference them later. Alongside these introductory adventures will be many more adventures for you to pull from when you don't feel like improvising or preparing a story ahead of time.
Intro adventures will be written by Michael Low, the TTRPG educator behind Starsworn and the Stories RPG system, and additional adventures are written by myself, Kirsty Kidd, Lyndon Ang, Noah Grand, Spencer Hibnick (AKA Pesto Productions), and Roman Penna.