I did one at Thanksgiving and it turned out real good. Here's what I did.
I spatchcocked it, cut out the backbone so it would lay flat. Seams to cook a little faster and easier for me to put in a brine.
I brined it over night, about 8-10 hrs. Just a basic brine, nothing too wild.
I had the smoker at about 220-240* and smoked it till the thigh hit 175* and the breast was also up to 175*. Took a while, can't remember how long, but it was very juicy and had a good smoke flavor. It was a hit.
I also did one w/out the brine, it was just as good but the meat wasn't as tasty. Still very good but the brine did add something to the meat.
Hope this helps