By the time I'd found this forum, Circuit had already retired, but left behind many samples of his work, and many words of advice, such as this link to a model viewer:
WOW Model Viewer - The Warlocks Den Forums
In general, if you are fairly familiar with a graphics editor like GIMP or Adobe Photoshop, most of it is easy. A model viewer enables you to take a good picture of your character, and there are several of these, although these take a little learning as well. It took me about a day to make my sig, including some learning curves and computer issues.