If iots your first turkey, I suggest doing it nekkid. Salt and pepper, maybe some "Kitchen Bouquet", and either a fruit or veggie in the cavity. That way you are confortable with cooking it and you have a good base line to just with in the future.
Heres my last turkey.
http://www.smokingmeatforums.com/t/147498/smoked-turkey-a-bds-tribute
I suggest you skip the injections, marinades, brines, and every other modifer to the smoke.
Use a light smoke, thats basically nearly any wood other than hickory, mesquite, and oak. If you are not used to them chances are you'll over smoke the meat.
If I can be of any help or you need a question answered I'll gladly try to help.
And to answer your question, no there is no need to wrap a turkey. Any rub is fine, I use salt and peppper mostly occassionally I add some tony's.
If you are having a big group, I'd recommend you look at two 13 to 15 pound turkeys instead of one monstrosity at 20+ pounds. Those are for the Norman Rockwell pictures.
Good luck, don't stress, and remember to enjoy the smoke.