Weber recommends charcoal briquettes. I don't see anything about a wood fire but it explicitly says no charcoal impregnated with lighter fluid, beads, or lump. And no lighter fluid.
I read this on TVWB: "Wood must be burned down to hot coals in a separate container, then shoveled into the WSM, and this process must be repeated several times during the course of cooking. Most people who try this once don't try it again."