This tutorial is broken into 4 parts. These are the steps I take for each fire I make, and also fit the pattern by which I learned in the first place. Starts out like the example file, one emitter in a small Fluid Container (the box). Second step is to add a bunch of emitters in a box that will fit the scene you are adding a fire to. Then we add the geometery, in this tutorial I use some simple logs for a fireplace. Final step is to put it in the environment with appropriate lighting - which I do entirely in maya. It would probably be way easier to composite it in another program, but I don't do compositing.