Well here is what I do. first I make my brine, I usually use this recipe, but doubled or tripled:
1 1/2 cups, Kosher salt**
**See notes below regarding amount of salt
1 1/4 cups, brown sugar
10 whole cloves
3 teaspoons, black peppercorns
1 1/2 gallons (6 quarts) apple juice or cider (non-alcoholic)
6 small oranges halfed and squeezed (put all into pot)
[optional: 3 teaspoons, dried thyme and/or 3 teaspoons, dried sage]
Combine all ingredients in a non-reactive pot, bring mixture to a boil, lower heat and simmer for 15-20 minutes (partly covered). Allow brine to cool completely.
Rinse turkey under cool running water, inside and out (remove giblets from body cavity). Pat turkey dry with paper towels, then immerse turkey in cooled brine.* Turkey should be completely submerged in liquid (place a plate on top of the bird if necessary to keep it covered with the liquid).
Cover the pot and refrigerate for 8-10 hours or up to 24 hours. Remove turkey, rinse, pat dry, and roast as usual.
*Be sure the container used for brining turkey is non-reactive: use enamel, glass or crockery or stainless steel - never cast iron or aluminum. The pot should be just large enough to contain the turkey (so the brine will be sufficient to cover the bird).
** NOTE REGARDING THE AMOUNT OF SALT IN BRINE: A milder brine may be made, which may have a less flavorful result – but if salt is a concern (the entire turkey will absorb only 10-15% of the brine) the amount of salt may be reduced. For the desired chemical effect to take place, however, the proportions cannot be less than 2/3 to 1 cup of salt per gallon (4 quarts) of water or other liquid.
**TYPES OF SALT: Kosher salt is the ONLY type of salt to be used in making brine (it is sweeter and more pure than ordinary table salt). Kosher salt is available in two varieties. The most common is flaked salt (example: Morton Kosher Salt) which has been pressed into flakes by rollers. The other type is a four-sided crystal (example: Diamond Crystal Kosher Salt). The crystal-shaped salt measures differently because of its shape. Use about 25% (one quarter) MORE crystal salt than flaked salt when measuring for brine or other recipes. The formula is: 1 tablespoon of regular table salt is equivalent to 1 ½ tablespoons flaked kosher salt, or 2 tablespoons, diamond crystal kosher salt.
After the turkey is brined I rinse well, pat dry and put on a wire rack with drip under in the fridge for 12-18 hours to dry up a bit.
When its time to smoke I get the smoker going and set the temp for 275. While I am waiting for the thin blue smoke to start rolling I either rub some extra virgin olive oil on and a rub of garlic, pepper,salt. Or I rub butter under the skin and the rub on top.
Once the smoke is going, I put the turkey in and go until I hit the proper IT in the thigh and breast. Typically I have found that a 12-14 pound bird takes about 4-5 hours. If the bird is done early, you can hold it in a cooler.
Good Luck, smoked turkey is great!