I'd get him on here, or sign one of you up for the free 5 day so the good food gets there faster (speed up the learning curve) on the how to side.
even a non Electronic meat thermometer is essential to low and slow if you don't have one, electronics are great, but they also need new probes from time to time, so old school would be smart as an also even if you go high tech IMO. Lowes and walmart sell most of what you need, outdoor stores like a Cabelas/Basspro might have a similar/different selection at a higher price.
rib racks are a good idea, if you decide you like ribs, a set of welding gloves would be good if this is a round upright brinkmann so he doesn't get burned reaching in there. Tongs and grabbers are OK, but I always end up using my hands, especially if you get into wrapping in foil and etc. I use Ov-Gloves, but they don't protect above the wrist, so they might not work for you if its a round upright. what model or general shape smoker did you get blessed with? there might be some specific things people use for THAT smoker that might be better gifts, just a thought.