The BEST planning takes place when you choose what KIND OF COOKER. If you plan on many low and slow, then a well insulted and properly set up ceramic grill will do the job. Efficient on the fuel, resilient in most environments.
No electro gadgets here. I just set it and forget it (someone say that before?).
Getting to know your cooker is half the battle. Now that I know size of the draft port opening to the desired temps..... easy!
Cooking on a KamadoRocket, Weber Performer, Hibachi & MSR WhisperLite (my only gasser).