Question about Missionary Training for missionaries:
"Should I pursue a graduate degree in my profession or stop at a bachelorís degree?"
I suggest at least two or three years at a Bible school or theological seminary, with a focus on cross-cultural communication. It's one thing to know principles of your profession. It's quite another to know how to get those principles across in a context totally foreign to you, because you will undoubtedly encounter people who find it difficult to receive ideas from an "expert" from another country.
If you plan to teach in a recognized institution, you'll undoubtedly want a higher level of training. But the people in the local situation should advise you on the details. In my own case, I'm glad that I did my post-graduate study after my first term on the field. I had the language, knew the situation, and was aware of what I needed, which guided my choice of both subject and place to study.
I know it can seem as if a waste of precious time. But while you're in graduate school, you have the time to further develop your plans for where and with what organization you will serve. It also allows you to "friend-raise" as you share with others the ultimate purpose behind your studies. The time spent getting a graduate degree is a perfect opportunity to better prepare for all God has planned for your exciting future.