To marry sacramentally, a couple must go through a marriage preparation program (up to 10 weeks including a retreat) organized by the Parish. There is also paperwork that must be filled out and documents to provide. Marriages should be planned at least a year in advance.
If a couple is married civilly and wants to convalidate (sacramentalize) their marriage, they must go through a marriage preparation period (up to 10 weeks including a retreat), fill out some paperwork, and provide various documents.
Some marriage situations are complex and require a formal annulment to be realized. In these cases, it is best to make an appointment with a deacon to have him assess your personal situation and offer steps to be taken.