I season on the skin, and under. Olive oil and a homemade rub of Thanksgiving type herbs, that compliment my stuffing seasoning.
I don't usually inject when I smoke/roast, but I do inject whenever I fry them. Personal preference of mine. Some people will brine, rub, and inject, it's REALLY all about your personal preference in regards to this sort of stuff.
The Life of the Knife is Ended By! The Wife.