Wow. You must feel so overwhelmed! Put white gloves on before you touch any of the paper. I am not teasing! The oils from your hands is not good for the paper. Historians would bang your door down to get one glimpse of what you found. If you are not familiar with old old very old paper please research it or something. If you need a contact who has been doing it a very long time please send me a pm and I will do my best to put you in contact with him.
You have a treasure chest in your possession. I am so happy for you. Goodness. /Regards, Dorothy