Look for this book:
IFA, A COMPLETE DIVINATION by Ayo Salami.
It is excellent.
The meaning of the 16 Odu Ifa of the Ifa is based on 16 symbolic or allegorical parables contained in the 16 Core Chapters or Principles that form the basis of the Ifá, a system of divination of the Yoruba people of Nigeria. The Grand Priest of Ifa, the Babalawo or Iyanifas are the Priests and Priestesses of the Ifa Oracle that receive and decode the meaning of the Divine Messages contained in the Odu Ifa Parables that are transmitted ...