There should be a curriculum for those who want to teach. One has to go through a series of lectures and sessions. Also, you have to be very well read and know a lot about orthodoxy. At my church we had "servant prep" which was a way for preparing our youth for teaching and giving lectures.
Pope Shenouda also requires all male Sunday School teachers to be ordained epsaltos or above, so you might have to check with Abouna about that bigeee.
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God Bless,
Copt Andrew
GB
Tony