"The waiting is the hardest part." - Tom Petty.
Seriously, though, you now have an opportunity to try your hand at a variety of seasoning oils. You can use tried-and-true old Crisco, or, if you have a Whole Foods nearby, they sell a house brand refined grapeseed oil that's excellent for an initial seasoning. It has a 450* smoke point, so you can crank the pan up in the oven to 500 beforehand (helps darken the iron), apply a thin coat (wipe it off real good), and then put it back in the oven for a bit before letting it cool.