Vatican issues document on how to prepare a homilyhttp://www.catholicculture.org/culture/library/view.cfm?id=10824
In the first part, entitled The homily and its liturgical setting, the nature, function, and specific context of the homily are described. Other aspects that define it are also addressed, namely, the appropriate ordained minister who delivers it, its reference to the Word of God, the proximate and remote preparation for its composition, and its recipients.
In the second part, the Ars praedicandi, essential questions of method and content that the homilist must know and take into account in the preparation and delivery of the homily are illustrated. In a way that is meant to be indicative and not exhaustive, interpretive keys are proposed for the cycle of Sundays and Feasts, beginning at the heart of the liturgical year (the Sacred Triduum and Easter Time, Lent, Advent, Christmas Time, and Ordinary Time), and also for the Masses of weekdays, weddings, and funerals. In these examples, the criteria outlined in the first part of the Directory are put into practice: typology between the Old and New Testaments, the importance of the Gospel reading, the ordering of the readings, and the nexus between the Liturgy of the Word and the Liturgy of the Eucharist, between the Biblical message and the liturgical texts, between celebration and life, and between listening to God and the particular assembly.