Os #8 or traxxas 3232 plugs. Cold or hot weather those are my plugs of choice. I live in the south though so maybe someone from your area may have a better suggestion. It doesn't get much colder than 20 degrees here and it's usually in the high 30's in the afternoon's in the winter.
Your welcome. Honestly with that engine the 5 tank break in will do fine. The heat cycling break in is really for big block engines. If it's cold outside you may still want to wrap the head but other than that you can use the standard run in methods.
Congrats on your purchase! Welcome back to the hobby! I have always ran 30% with 11% oil and have never had a issue. Of course the lower nitro content will give you a little more engine life. Honestly though the extra tank maybe two or three you will get out of a engine isn't worth the lag in...