Help with turkey.....?

i have never cooked one and i need to know a couple things, first if it is frozen and i need to cook it on the 19th when should i put it in my fridge to defrost? second do i need to put it in a oven bag or how would you recomed it be cooked? do you put stuffing inside of it if so why? season it? bast it? if so how offten? really have no clue how to do this so any help is very good thank you ahead of time