Eucharist
Didache Sacramental Preparation Series: The Sacrament of First Holy Communion
Midwest Theological Forum
Spirit of Truth Sacramental Preparation
Sophia Institute for Teachers
Out of print, but still available.
Espíritu de la Verdad: Preparación Sacramental para la Primera Reconciliación y Primera Comunión
Spanish
Sophia Institute for Teachers
Programs for First Eucharist preparation, Mass books, posters and videos.