How do I put fields in MS word?

We have a lot of documents at work and in these documents, the same numbers, names, etc… need to be repeated very often. We have some templates and go through and fill them out each time, but this is error prone and we can make mistakes. I was wondering if there is a nice and easy way to get fields in word so that I can put the fields in the templates and then just fill in those values each time.

Also, this needs to be pretty easy to use since a lot of the people using it won’t be very computer savvy.