This study looks at discipleship from two different angles and can actually be broken down into two separate studies if desired.
The first section discusses external discipleship, namely what a discipling relationship entails and who could or should be a disciple. There are four methods of discipleship discussed and the differences of each. These methods are: modeling, mentoring, instructing, and coaching.
The second section entails a look at discipleship as a spiritual discipline. We are called to be disciples and to make disciples. If we are to be and make disciples, we should know what it really means to be a disciple and the cost involved. Some of this study is based upon Dietrich Bonhoeffer’s book The Cost of Discipleship 
Part 1 – External Discipleship
Part 2 – Spiritual Discipline
The Simplicity of a Disciple’s Life
Discipleship and the Unbeliever – Part 1