Take a lot of photos from different angles; you can’t submit too many photos.
You provide us with a sketch of the site with measurements. We do not visit the site. While this does not need to be a work of art, it does need to be legible and neat enough so we can easily work from it and not have to come back to you for questions.
If the client has given you their goals, likes and dislikes, list them in a simple doc for us.