Who's Who in the Church
Christ is the head of the Church. He appointed Peter to be the first Pope. All the other disciples were also bishops, but Peter was the leader, first among equals. From there there is an unbroken line of succession to the current pope, Benedict XVI. Beneath the pope are the bishops, beneath them, the priests and the deacons.
Catholics and Prayer
Reasons for prayer: thanksgiving, meditation, praise, supplication, etc.
Some prayers: The Our Father, crossing yourself, Hail Mary, doxology (Glory Be, Gloria, etc), Apostles' Creed.