I have a lot of cast iron. most handed down from relatives, but i have bought a few used pieces and one or two new ones. I usually season things with lard. heat the pan, put on lard, and reheat, wipe it out, let cool and then do it all over again a couple more times to get a good seasoning.
I have an aunt that seasons her cast iron by making donuts, says you have to make donuts at least 3 times before you can cook anything else in a cast iron pan or pot. not sure what she does for her griddles, but we all make sure to be around when she is seasoning pots and pans! I
I have one of the corn bread pans that make corn bread sticks that look like an ear of corn. Love the thing! only makes six so not a lot to share, since the first two are MINE.
Your 16 inch fry pan will be a great chicken fryer! lucky you.