Hi Peggy, welcome to TVWB.
Since you are a new user, just start off basic: fill the pan with water, and start smoking. The water is a heat sink to prevent too high temps. Temp control is done with bottom vents, not water levels. Always leave the top vent wide open to prevent/reduce creosote buildup.
Smoke the brisket to internal temps around 195, probe for tenderness. It should be like probing room temp butter, it will be so tender. Slice across the grain about a 1/4" thick, and enjoy.
Save the advanced (waterless) techniques for when you are much more experienced. HTH.