thaw completely in the fridge (may take several days) if frozen. rinse and pat dry. remove neck and giblets.
read basic directions on the wrapper for a ball park idea of cooking time. If turkey has "basting liquid" already injected there is no need to brine.
season outside of bird (if you stuff it do so loosely, and have all ingredients cooked)
the bigger the bird the lower the temp. 350-325. If it is getting too brown, tent with foil.
basting? maybe once. the less you open the oven, the more evenly the bird will cook. Turn it every hour back to front as oven heat can be variable.
If it has a pop up timer use it. If not, get an instant read thermometer. The USDA says 180, but 165-170 will give you a moister bird and is perfectly safe. Check temp in thick part of breast and in the stuffing. Let rest (tented) for 15 min before carving.