First Fire Test and Heat Clean, season?

So I just built my first mini with a silver. I cut out the entire bottom except for an inch of rim of the tamale pot and landed expanded metal on that. Then I cut the handle off of a cast-iron lodge skillet and landed that on the expanded metal. With a charcoal basket 3 inches tall made of expanded metal I reached a temperature of 500°F for 1.5 hours with the vents wide open, kingsford, and some cherry chunks. I was hoping to sort of bake it clean of metal impurities and maybe season the grill some. Food would come on the next fire. Any thoughts on that?
How do in post pictures using mobile?

Thank you guys and gals you really helped with the great mini project.