How does the collective go about making omelettes?

I was recently hired by a fairly swanky restaurant to prepare egg dishes to order for the guests that visit the buffet. During the week, this means scrambled eggs (easy enough), and during the weekend it means omelettes. Now, I have never made an omelette before (successfully, anyway). Though my boss has said he will show me how in a crash course before my first shift, I think I’d be a lot more comfortable if I practiced before hand. Having to quickly cook and shovel out omelettes under the penetrating gaze of a horde of quests is probably stressful enough when you know what you’re doing; having only a half hour of experience probably wouldn’t be too great.

So, I’d like to practice over the next few days! How do you guys cook omelettes? Anything I should know? Any hints? Tips? Are their any absolute and utterly unbendable laws of omelette making I should take to heart?

Thanks in advance!