There are several ways of preparing notes but the best system I've come across was taught to me by Tack Training in the early seventies. They call them confidence cards and I recommend this system.
Obtain some cards about the size of a postcard and at the very top, put a key phrase or sentence that reminds you of the subject.
Underneath this heading, write your development points using the key words mentioned on the last slide. Use only two or three words for this. Remember these are prompts only.
Where necessary, note any exhibits you are to use by making a mark on the card. A worked example of a confidence card is shown on the next slide.