It depends on whether you are interested in the Carmelites of the Ancient Observance (the O.Carms) or the Discalced Carmelites (the OCD). The Ancient Observance are the original Carmelites; the Discalced are the Carmelites who followed the reforms of St. Teresa of Avila and St. John of the Cross. Both orders have their own associations for laity. The O.Carm laity are called “third-order Carmelites,” “Carmelite tertiaries,” or “lay Carmelites.” The Discalced seculars are the Secular Order of Discalced Carmelites. They are called “secular Carmelites” and use the initials “OCDS” after their names. Unlike the lay Carmelites, the secular Carmelites are no longer a “third order.” They are fully members of the Discalced Carmelites, according to their state in life (not just laity but clergy may be secular Carmelites).
Generally speaking, it is better to be formed by the Carmelites who are in your local area. I recommend calling your diocese to find out if there are either lay Carmelites or secular Carmelites in your area. The diocese can give you contact information, and then a representative of each group can give you information on requirements for applying. If both are in your area, then choose the one that either appeals to you most or whose requirements you believe are more in line with your spiritual capacity.
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