Unless you buy a fresh turkey you'll need to thaw one - and in that case you'll have 2 choices. And once thawed, a turkey can stay in your fridge for up to 4 days before cooking. And if you're brining, you'll need a completely defrosted turkey 24 hours before cooking - so whatever you choose, don't wait till the last minute.
THAWING
Refrigerator - Keep the turkey in it’s wrapper (I like to put it in a large roasting etc in case it leaks) and thaw breast side up - it will take about 1 day of thawing for every 4 pounds of turkey
Cold Water - Keep the turkey in it’s wrapper and thaw in a bucket or cooler completely covered in cold water, but change the water every 45 minutes. This will take approximately 30 minutes for every pound of turkey
BRINING
A brined turkey is a juicy, more flavorful turkey. Ideally you want to brine for 24 hours before cooking - but if you don’t have that much time try for at least an hour a pound. And like thawing, you also have 2 choices: wet & dry. Either do the job, but dry brining is infinitely easier and way less messy.
Dry Brine - for about every 4 pounds of turkey
Wet Brine
Dry Brine
Wet Brine