Pretty much all you "need" (besides charcoal and some way to light it!) is a couple of thermometers. One leave in type thermo, preferably with an "ambient" probe and a "meat" probe, and one GOOD instant read thermometer. The first one is to monitor the fire and the meat as it is cooking, and the instant read keeps you from serving under cooked food as a back-up to the leave in type.
Some guys like the Maverick leave in thermometers, and other like the Igrill. both allow "remote" monitoring.
Everybody likes Thermoworks for instant read.