The vision to establish the process to test, train, affirm, and send those called into gospel ministry within your local church starts with you. It takes a pastor to recognize a pastor. In the same way you look with a keen eye for the discouraged hurting sheep in your flock, look for those that seem to be gifted as a shepherd. Look past the apparent immaturities and discern those who may have a special gift from God to teach his word and care for his people. In the absence of a formal process, take these individuals to the hospital with you. Let them tag along when you go visit the shut-ins. When you feel it is time, let them teach a small group Bible study where you can observe them in that role.
Begin teaching your congregation about their role in this process. Fellow laborers of the gospel, this process begins with us. You will not include this task into your already busy life of ministry if you do not see the need for it and that God has appointed us the vision casters of this responsibility in our churches.