Keep a small notebook
Write down the detail before deciding whether it is important. A phrase, a question or a sketch can become useful later.
A useful place to begin.
Practical prompts for reading, observing and making a little room for curiosity.

These guides are invitations to try something, rather than instructions for getting it right.

Before you begin
Yes. Send a short outline, why it matters to you and the perspective you would bring.
Ask about the current editorial approach before sending a full piece. An enquiry is not a publication agreement.
Describe the material and intended use so permissions can be discussed with its author.