Hi..

I always start mine out as researchers when the village is new. But I always have to have one farmer and one builder, and one doctor. Then when I start getting more people I train everyone as a researcher first. Then depending on the needs of the village I train them in farming. When the village is new builders are needed a lot so I make sure I have at least 3 trained as master builders. The general idea is once they have become a master at the first skill then switch them to the second skill and then the third. They have to master 3 skills to become an elder.