I told you yesterday that I prefer cooking with charcoal grills—but that doesn't mean you can't achieve great results cooking on a gas grill. As with charcoal grills, it helps to know where the vents are on your gas grill. (Hint: they're always at the back of the grill.) You'll also want to get acquainted with your grill's burner controls so you can effectively dictate the level of heat under the lid.
Here's some advice on cooking with gas grills. And again: happy grilling!