The matrimonial covenant by which a man and a woman establish between themselves a partnership of the whole of life, is by its nature ordered toward the good of the spouses and the procreation and education of offspring; this covenant between baptized persons has been raised by Christ the Lord to the dignity of a sacrament (Catechism of the Catholic Church)
Marriage is a lifetime commitment of a man and woman made before God to welcome new life and for the mutual support of the spouses. When two baptized persons commit themselves to marriage, it is a sacrament of the new covenant. Marriage between a baptized person and one who is not baptized is known as a natural bond; a holy and life- long commitment blessed by God.
If you are seeking to be married in the Catholic Church, you must contact a priest at least six months in advance of the anticipated wedding date. No other arrangements should be made until you have spoken with the priest. He will first ask you some questions to be sure that you are free to contract marriage before reserving any dates. You will also arrange to meet with him so that he may inform you of all that is needed to prepare for your wedding and your marriage. Marriage preparation sessions must be attended before the wedding.