Marriage is a “covenant or partnership of life between a man and woman, which is ordered to the well-being of the spouses and to the procreation and upbringing of children. When validly contracted between two baptized people, marriage is a sacrament.” ~ Catechism of the Catholic Church, #160
For parish-based resources, explore the Worship & Sacraments menu to the left and select the Marriage pages. We also encourage you to spend some time at the diocesan Marriage and Family Life website as well as at the Laity, Marriage, Family Life and Youth site of the U.S. Conference of Catholic Bishops (USCCB), including the USCCB's National Pastoral Initiative for Marriage (NPIM) and its related website, For Your Marriage.
All of these resources can assist you both in preparing for your marriage and in caring for your marriage, because "a wedding is for a day, but a marriage is for a lifetime."