‘One Thing’ is a three part teaching series on prayer produced by the Salvation Army but for use in any local church context. The second part is now available ‘One Thing for the church: Growing Prayer Together' and features 7 sessions on how we can grow in prayer together in communities of faith. Website gives free access to study guide as a downloadable PDF and you can view all 7 sessions of the videos.
https://www.salvationarmy.org.uk/one-thing-for-the-church