Holy Orders is the sacrament which continues Christ's mission through the grace and power given to men to carry out the sacred duties of deacons, priests or bishops.
Bishops (episcopoi) are those who have care of multiple congregations and have the task of appointing, ordaining, and disciplining priests and deacons. They are often called 'evangelists' in the New Testament. Examples of first century bishops include Timothy and Titus (1 Tim. 5:19-22, 2 Tim. 4:5, Titus 1:5).
Priests (presbuteroi) are also known as "presbyters" or "elders." In fact, the English term "priest" is simply a contraction of the Greek word "presbuteros." They have the responsibility of teaching, governing, and performing the sacraments in a given congregation (1 Tim. 5:17, Jas. 5:14-15).
Deacons (diakonoi) are the assistants of the bishops and have the task of teaching and administering certain church functions, such as the distribution of food (Acts 6:1-6).
An extensive account of the teaching of the Catholic Church on the Sacrament of Holy Orders is given in the Catechism of the Catholic Church, 1536-1600
If you think you may be called to the sacrament of Holy Orders, or if you are simply interested in Holy orders, please call one of the priests of the parish. He will be happy to talk to you about it, and, no, he will not laugh at you!