If you truly mean "right away", as in the day you give it to your husband he'd want to start smoking
, you'll want to consider a few other things beyond the excellent advice you've already gotten:
Make sure the WSM is assembled ... either do it yourself if you're comfortable with basic assembly, or buy locally already assembled. I bought mine through Amazon and it comes unassembled (and unfortunately needed some replacement parts - Weber's customer service took great care of me, but it added a week before I could use it). Assembly isn't difficult, but takes a little time - don't ask me how much time/alcohol it took for me to get the rubber temperature-probe gasket into the gasket hole.
Look at the recipes
here and decide what he'd want to cook first (or maybe what you want to eat first - feel free to admit this is a gift for you too
) - and ideally not something that is a long 12-hour cook like brisket or pulled pork. My first cook on my WSM was the "basic baby back ribs"
recipe, which came out great. Make sure you've gathered all the ingredients. For smoke wood, probably easiest to buy a bag of Weber smoke wood, pick the one closest to the recipe you choose. And make sure you give him enough time (plus some extra, since it'll take some time for him to absorb the instructions and do things for the first time) before dinnertime.
Of course, maybe you don't mean "right away" like that, in which case all of the above doesn't apply. Either way, I'm sure he'll enjoy the WSM - and you'll enjoy the bbq too
.