St. Theresa provides Sacramental Preparation for Baptisms of Infants and Children as well as Sacramental Preparation of Adults through Rite of Christian Initiation of Adults and Confirmation.
If you are and adult and have received the Sacraments of Baptism and First Communion and still need to receive Confirmation, then you should attend the Confirmation formation.
If you are unbaptized or baptized and haven't received your First Communion, then RCIA is the program you need to attend.