I did clean the new pan cause I work at a store and know how dusty a store can be... by habit I used salt to remove the dirt with a wet dishcloth. Then I air dried. The old pans where already seasoned but then you should re-season them once in awhile.
I used some lard (make sure it is a rendered type of lard) to spread all over the pan. I did the handle too; cause of a spill once that had me doing a work out to get the burnt something off the handle. sigh.. Learning by mistakes.
I left them in the oven after the timer went off just cause I thought it might not be a bad idea with all those extra pans in there... then wipe off the oil on the top of the pans..
I love pan seared steaks. Well it was a Rachael Ray hint (by the way the link doesn't take you to the Rachael Ray site but to another link I found from pinerest)
Some of the pans I got from family. My grandmother cook many things in the cast iron skittles. I do have a griddle that is cast iron and I used that for pancakes and grilled cheese.