Well some religious communities have associates;people who assist the community in their work.You might contact the Salesians;Franciscans; Missionary Sisters of the Sacred Heart;The Columban Fathers and Sisters;etc.
You might ask them if they have any lay people who volunteer and help out.
Here is someone you can contact: Catholic Network of Volunteer Service
1410 Q St.NW
Washington;DC 20009
(800) 543-5046
Fax
202) 332-1611
Email:volunteer@cnvs.org
Web:
www.cnvs.org
Also I assume if they accept you that you will recieve training .If sent overseas;you will need to learn the language and customs of the people you are dealing with.You will probably work under the guidance of the group you are with plus any religious missionaries who you have to deal with. Listen to what they say;especially if there is a priest ;brother or sister who has been there for years.They know the people and the needs.Also in Africa and elsewhere there are native communities of men and women religious who help their people to know Christ.They too are a good source of information and help.
There are plenty of dangerous places here in the US that need home missionaries.
Also be aware that sometimes religious and other orginizations both Catholic and even Protestant will remove missionaries from areas that are too dangerous to work in due to the volital political or ethnic situation. It’s like even armies will retreat due to overwhelming odds.
I would also leave off the part about wanting to go to dangerous areas to do mission work.
They might think you have a desire to be a martyer or something and may be very hesitant to accept you if they believe that is you’re only reason for going.
Now i think your heart is in the right place;but as an outsider that is what they will think about your choice of mission field. Most missionaries sometimes wind up in dangerous situations like in Africa or elsewhere because of various changes such as political uprisings;etc.
Good luck with your search and hopefully they will get back to you.God Bless.