AJ, here is my list. Hope it helps.
Weber starter cubes
Weber Chimney
Heat resistant gloves- preferably ones that cover forearms like welding gloves
lighter/matches
Meat thermometer- Thermapen is the gold standard but others are available
Kettle thermometer-
WKC Thermometer GuideTimer- I like my Thermoworks Timestick but any timer will do.
Charcoal Baskets- I like the old style Weber wire baskets but others like the stamped aluminum.
Disposable drip pans- I buy the costco packs for $8 for 20 if my memory serves me right
Reynolds heavy duty aluminum foil- I really like the heavy weight and width
Grill brush- Whatever works for you, but don't get a steel bristled one. They will mark the chrome grates and make them prone to rusting.
Long tongs and spatula- I really like the ones you get at a restaurant supply store. Good size, not overdesigned, and cost effective.
Knife
Camera for taking pics.