What kind of files, graphics, and information would be in an "identity starter kit?"

I am a first year design student, and my uncle informally asked me to create a logo for him. He is working with a woman who helps people grow their business by getting them on social media and building them websites.

So I sent her the logo, but it turns out that she was really looking for me to create an identity for him. She says that she isn't a graphic designer, and asked "What do you suggest as a basic starter kit for him?"

Since I have no experience with this, I have no idea what should be included in an "identity folder," as she called it. Could anyone help me out? What kind of graphics, information, etc. should I be sending her, and what kinds of files? A very detailed answer would be highly appreciated... I don't know what I'm doing!