Here's old reliable, a few folks on here swear by it:
Slaughterhouse Poultry Brine By Tip Piper of Hillbilly Vittles
1 ½ Gal Water
½ C Salt - Kosher
½ C Dark Brown Sugar
2 tsp Garlic Powder
2 tsp Onion Powder
2 tsp Cajun Spice (Louisiana Cajun Seasoning)
2 tsp Celery Seed
Slaughterhouse Poultry Injection
½ Pkg Good Seasons Italian Dressing
2 tsp Garlic Powder
2 tsp Celery Seed
2 TBS melted Butter (non salted)
2 C Apple Cider
Slaughterhouse Spritz (Good fer everthin!)
8 oz Apple Cider
6 oz Water
4 oz Whiskey
2 oz Cider Vinegar
Brine overnight, rinse well an pat dry, inject, use some a yer favorite rub on the outside an in the cavity.
Smoke at 300°F - 325°F to an internal temp a 170°F in the breast. Don't do much over a 12 - 14 pound bird, ya wanna get through the 40° - 140° zone in under 4 hours.
Pull off the smoker an let rest fer 30 minutes before carvin, if ya wan't a real treat baste that bird with a mixture of 50% honey - 50% Melted unsalted butter.
Let me know if ya need any help.
Oh yeah, choice a wood, like a stronger smoke flavour, Hickory, milder smoke an a touch sweet, Maple, fruitier, Apple er Cherry. My personal choice fer at home is Hickory, the birds I sell er done with Maple.