Ordination in most mainline Protestant denominations requires a Master of Divinity degree from an accredited seminary. At seminary I did major elective work in Christian Education. This was a huge help in being called to a larger congregation in a staff position. My entire ministry has been served in various capacities in these larger churches. After I had been serving in the parish for about ten years, I returned to school on a part time basis to earn a Doctor of Ministry degree, focusing on work in Scripture.
Continued study is crucial to continued growth.
We are expected to be orators, teachers, administrators, motivators, counselors, spiritual directors, financial planners, and maintenance engineers. Musical background doesn't hurt. The truth of it is that any individual who is exceptionally skilled in more than one or two of these areas is very unusual. So we all spend a good deal of time doing things we're not particularly good at. But the positive side of that is that there is no profile of the typical person called to ordained ministry.