A peer discipleship group should consist of 4 brothers or 4 sisters in Christ.
Any follower of Jesus who would be considered to have a level of faith and understanding beyond the level of Alpha and Christian Foundations. The option of Alpha or Christians Foundations should be considered preferentially otherwise.
We recommend meeting at least once/month for a duration of one hour with half of the time for sharing and listening and the other half looking at truth and intercession in prayer and seeking the Holy Spirit.
So I say, walk by the Spirit, and you will not gratify the desires of the flesh. For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are in conflict with each other, so that you are not to do whatever you want. (Galatians 5:16–17 NIV)
This is very much up to the group. The formation of these groups should be self-motivated and there are many ways to meet that promote sharing and accountability. Some people find it easier to share when doing something such as walking or crafts, others might want to meet in their homes. The key is to hold one another to account as to how the time is being used.
Before Jesus ascended to heaven, he made clear in the Great Commission that making disciples was the call of the church (Matthew 28:18-20). Groups should therefore hold to a key intention of multiplying over time and the formation of groups of 4 is in part to facilitate this with the idea that a group splits in half with each two members looking to add another two and so forth. We would anticipate consideration of multiplication to occur after a twelve month period and then be ongoing.