Those instructions are pretty good.
Lighting is the key. You're never likely to have too much, but it's easy to have the wrong kind.
The first thing to do is to add a background. A white background does two things -- it reflects light to help kill shadows and it makes the colors 'pop' more (and, if you use Photoshop for color correction, it gives you a perfect baseline white to correct toward).
The second is to use indirect, reflected light instead of harsh, direct light. A single light source with a white background and one or two white reflectors placed around the subject will scatter indirect light to soften up shadows. You need shadows because they create depth; you just don't want harsh shadows.
As to light placement, there are so many possible variations of light and reflector positioning that it's impossible to give a single answer. Put the light behind and above your left shoulder and then start moving the reflectors around, watching the shadows as you do -- you'll be amazed at all the different effects that can be produced. (A reflector can be as simple as a piece of white foamcore.)
Finally, watch the focus. You don't want the camera focusing on the background instead of the miniature. That doesn't seem to have been a problem so far.
The great thing about digital photography is that you can experiment endlessly until you find the setup that works for you. Like painting or any other craft, it takes practice.
Steve