The key components of brand identity. Before you create a style guide, you need to know your brand. There are five key components. Firstly, mission, vision, target audience, brand, personality, and lastly, core values. Together. These are the most important things needed to establish your brand identity because they tell the world what you stand for.
All the other parts of your brand style guide are tangible elements that communicate those key components to the world through design, mission and vision. Write a mission statement about why your company exists and a vision statement about where you want your brand to go. This can be big, you're going to change the world or small, you solve a small annoying problem as long as they true to your brand