Career Crisis

I am haveing a crisis. I have the job I want to do in mind but I just dont know the technical name for it or what training is needed to do it. The discription is as follows:
Going to a company and installing software. Then you teach the people how to use it.

What career is this?
What training/certifacation do you need?

I know these questions probably sound dumb. But I rather ask then never know. Any advice is appreciated.