Servers should be mature enough to understand their responsibilities and to carry them out well and with appropriate reverence. They should have already received holy communion for the first time and normally receive the eucharist whenever they participate in the liturgy.
Since the role of server is integral to the normal celebration of the Mass, at least one server should assist the priest. On Sundays and other more important occasions, two or more servers should be employed to carry out the various functions normally entrusted to these ministers.
Servers carry the cross, the processional candles, hold the book for the priest celebrant when he is not at the altar, carry the incense and censer, present the bread, wine, and water to the priest during the preparation of the gifts or assist him when he receives the gifts from the people, wash the hands of the priest, assist the priest celebrant and deacon as necessary.
Servers respond to the prayers and dialogues of the priest along with the congregation. They also join in singing the hymns and other chants of the liturgy.