What happens next?

How to season a cast iron skillet
Preheat the oven to 350 f (177 c).
Don't plan on cooking anything else in the oven while you season the cast iron, since the process can be affected by steam created by cooking other food.
Wash and dry the skillet.
Use soap and a scrub brush to completely scour it. This is the only time you'll be using these items to clean your skillet; after it's seasoned, you no longer scour it.