Marriage in the Catholic Church is the "covenant by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring", and which "has been raised by Christ the Lord to the dignity of a sacrament between the baptized (Can. 1055)."
The Church requires that you notify the priest of your intended Catholic marriage at least six months prior to the wedding, so as to allow adequate time for assessment and preparation.
You are asking for a Catholic marriage, a sacrament in the Catholic Church. The purpose of this time of marriage preparation is to prepare you (the couple) to enter into a lifelong commitment of love. This will be a time to reflect on the true meaning of marriage-- its beauty, its commitment and permanency, its unity of love and openness to life, and its responsibilities.