In practice, how can I disciple other Christians?

Join a church.
Arrive early at church gatherings and stay late.
Practice hospitality with members of your church.
Ask God for strategic friendships.
If possible, include a line-item in your family or pastoral budget for weekly time with fellow Christians. Discuss this matter with your spouse. If possible, provide such a budget line for your spouse as well.
Schedule regular breakfasts, lunches, or some other culturally-acceptable social engagement with teachable individuals (of the same sex). Depending on the person, you may decide to meet once, indefinitely, or for a set number of times (say, five). If you and the individual share a pastime, look for ways to share that pastime together.
Ask them about themselves. Ask them about their parents, spouse, children, testimony, job, walk with Christ, and so on. In asking questions, however, do so in a manner that’s appropriate for your cultural context (don’t scare them!).
Share about yourself.
Look for ways to have spiritual conversations. Maybe decide to read the Bible or some other Christian literature together.
Consider their physical or material needs. Would they benefit from your help?
Pray with them.
Depending on your home situation, invite the person to drop by your house or spend time with your family. Let them watch you live life.