Work and travel process, how do people make money from it? -

There are certain people that work with foreign travel agencies, what they do is lets say they live in the U.S, they talk to businesses and hotels and try to find job for work and travel students. This seems like a nice on the side job to me. Can anyone explain the process to me. Do i need an office to start this?

Come to me, all you who labor and are burdened, and I will give you rest.