In this article about the vision behind Brian Dye's legacy conference, I was blown away by the amount of young men that he has invited into his life to follow him as he follows Christ. His hospitality is such a tool for disciple making. I pray it gives you a picture of true life on life investment.
https://www.thegospelcoalition.org/article/brian-dye-building-legacy-disciples-chicago/
Word Centered Discipleship
The greatest curriculum for disciple making is the Bible. We want to build into people in such a way that the only thing they would "need" to invest in others is the word of God and the Holy Spirit. In this article John Sarver talks about recapturing the importance of using the Bible as the main tool to disciple others.
http://downlineministries.com/word-centered-discipleship/