The Urantia Book gives detailed personal descriptions of each.  Most were married, and some had several children.  All except the Alphaeus twins were graduates of synagogue schools.  Most were rough fishermen.  They were not all the same in terms of schooling.  Many carried swords.  Many were martyred.
Their organization is detailed in The Urantia Book.  Andrew was the chief.  Peter, James, and John were Jesus' personal aids.  Philip was the apostolic steward.  Nathanael cared for the families of the apostles.  The itinerary was managed by Thomas.  Matthew was a fund-raiser.  Simon was in charge of diversion and relaxation.  The Alphaeus twins were the errand boys; those who took care of the multitudes.  Judas Iscariot was treasurer.  Matthias was chosen to take the place of Judas. 
They called Jesus “Master”.  They also called Jesus “Rabbi”.  The apostles were cheerfully ignorant of much of rabbinic learning and yet pious and righteous.  The term apostle designated the chosen family of advisers of Jesus from among all believers.  They had to study 3 hours each evening in preparation.  Whoever wanted to become apostles should disregard himself and take up his responsibilities daily.  On many occasions they were accompanied by the apostles of John the Baptist.  They had to work to keep their families cared for.  Matthew never openly solicited funds from multitudes.  Jesus forbade them to become embroiled in politics.  Jesus warned them that the enemy would try to drive them away from each other.  Jesus instructed them not to worry about the future because the Father supplies all the needs of the diligent.  He told them not to be anxious for their lives.  They considered Jesus their best friend.  Wednesdays were established by Jesus as days of rest for the apostles.  His moment of maximum ecstasy was with the healing of 683 people at sunset.  They urged Jesus many times to perform cures, something that was not in the purpose of Jesus.  Jesus asked them to dedicate themselves to ministering to the sick.  Andrew imposed strict rules on working with women that Jesus took it upon himself to modify.  On several occasions they feared for their own safety.  The twelve were often a serious, sober, and chastened group of disillusioned men.  Jesus' boldness terrified the apostles.  Attempted to dissuade Jesus from entering Judea.  Jesus accepted Judas, a Jew, telling him that they were all of one flesh.  The apostles are counted among the few who chose to fully receive Jesus.  They went several times through a rise and then a fall of faith in Jesus.  They did not help Jesus cleanse the temple.  Did not fully understand the teaching of Jesus.  Each taught his own vision of the gospel.  Personal loyalty to Jesus of the apostles transcended faith in the teachings.  They were very resentful of Judas for his betrayal. 
The apostles were blinded by the belief in the temporal, materialistic realm. They believed in the Messiah.  They deviated with their concept of the kingdom of heaven from the concept of Jesus.  They believed in the immediate second coming of Jesus.  For them Jesus was the Eternal Son.  They thought Jesus was immortal.  They believed that Jesus was the Messiah.  Their belief was that the Messiah would sit on the throne of David.  On several occasions the apostles asked Jesus for a preference.  They believed that women are not equal to men.  They were miracle-minded, believed in miracles.  Were offended when others taught in the name of Jesus. 
Jesus believed in the faith of the apostles.  Jesus trusted his apostles and loved them.  He required the apostles to dedicate all their possessions to the common cause.  He indicated to them that religion would be an exclusive matter for the apostles.  Jesus saw to it that the apostles had good relations with the apostles of John.  Sometimes he did not reveal his plans to the apostles.  He often sent them aside to pray.  He sent them to preach two by two.  He forewarned the apostles of Judas' betrayal.  He did not want the apostles to be present at his arrest.  He gave the apostles an authority over all temporal things with respect to the kingdom.  He kept the apostles in service by contact with the multitudes.  He taught them to share with the poor, but not to be fooled by social parasites or professional beggars.  He forced the apostles to comply with practices that reflected the ideals of Jesus.  He prayed for the apostles to keep them from evil and sanctify them in truth.  He prayed to be honored in the apostles as he honored his Father.  He realized how weak and ignorant his apostles were.  The apostles underwent repeated disappointments and trials.  He warned them not to endanger their lives.  He wanted unity among the apostles. 
On January 12, AD 27.  During the post-ordination consecration Jesus instructed them with a special charge.  Jesus proclaims them men separated from all other men on earth.  Jesus showed up again on the same mount of ordination in the 14th apparition.