I bring some things to a photo session and then I let the client bring some things too. For instance, if I have a family session I might bring blankets and a stool, but the family may want a "family" sign that they have in a photo, so they would bring that along. It all depends on the session for the props I bring. Normally, I would bring different props such as a chair, stool, blankets and a chalk board. If it was an engagement session or wedding I may bring an "&" sign in case they would want to use it. If it was a child or children session, then I would bring my little lady bug for the kids. l always have it with me in my camera bag, but I just wanted to let you know my little trick I use sometimes.
Also, if it was something special I was doing I would need more. For an example, If I was having mini sessions, I might do a background different or have a theme. A theme would be like school and I would bring a bunch of school type things for the photos.
I always bring my clipboard with the contract, an email sign up list and any other papers I would need.
Of course you can't forget, I bring my camera and my camera bag which I have a lot of little and big things I need in there too! That is about it!
Thanks for reading!