When you cast your charms, trust your intuition as to the message you recieve.
However, there are ways that you can break down your reading to offer you some guidance and structure.
You can imagine lines on your casting area, or use actual lines. You can use pen or tape on boxes or plates, or embroider lines, or use different colour material on fabric casting areas.
You can use the following image as guidance for you:
You can split your casting area into the following: