Add-on bedroom has metal carport pans for a ceiling. They are shiny white. I need to paint them with flat paint via roller. What type of paint can I use? Do I need a primer?

Silver paint, and roll it on.

Add-on bedroom has metal carport pans for a ceiling. They are shiny white. I need to paint them with flat paint via roller. What type of paint can I use? Do I need a primer?