“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
Do not underestimate the desire or the ability of the Church to help you to have a deeper appreciation of holy matrimony. This is a vocation, so entering into the Sacrament takes discernment and prayer. Living it well likewise requires a solid life of prayer, formation, and the help of the Church. If you are married and want help to live your marriage better, do contact your parish priest.
It can be very helpful to find a mentoring couple–a husband and wife who have been happily married for several years. They can provide support, encouragement, advice.
On Human Life–Married Couples should all read this Encyclical by Pope Paul VI.
Articles on Family Life--helpful, theologically sound, practical advice on how to live family life.
Natural Family Planning–what is it, how to practice it, etc. This website will help you get started. It is best to find other couples who live this.
ForYourMarriage–a resource created by the United States Conference of Catholic Bishops.
Cohabitation? Should a man and woman live together before they are married? No. The Pennsylvania Bishops published an excellent letter that explains the problems with this practice. The letter addresses frequent reasons people use to justify this behavior.