John 15:16 (NIV84) — 16 You did not choose me, but I chose you and appointed you to go and bear fruit—fruit that will last. 

Jesus was a Rabbi, but he was unlike any other Rabbi. Normally, people who wanted to become a Rabbi's disciple would choose the one they wanted. Jesus went  out and chose his own disciples. Normally, a Rabbi's disciples would accompany him for two or three years, and then leave him. Jesus chooses people for life.

When Christ calls someone, he bids them come and die - Dietrich Bonhoeffer.

When Jesus calls us, he calls us to take up our cross, and that means we are to die to our plans and live only to his. 

Mark 8:34 (NIV84) — 34 ...... “If anyone would come after me, he must deny himself and take up his cross and follow me.

When we are chosen by Jesus, he commands us to go forth and make other people his disciples, teaching them to learn and obey everything he has commanded us to do.

Matthew 28:18–20 (NIV84) — 18 Then Jesus came to them and said, “All authority in heaven and on earth has been given to me. 19 Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 and teaching them to obey everything I have commanded you. And surely, I am with you always, to the very end of the age.”

Disciples are made through: 

Worship, Prayer, Fellowship, all proceeding from the study of the scriptures.

2 Timothy 3:16–17 (NIV84) — 16 All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, 17 so that the man of God may be thoroughly equipped for every good work.