First metal I heard and liked was Cradle of Filth, some song from "The Principle of Evil Made Flesh". First UG metal I liked was "Mazzatello" by Brodequin.
No idea what the first song was, but my first - let´s say hard rock - album was Dynasty from Kiss. My sister loved the song "I was made ..", so she bought me the album for Christmas 1980. That is where my personal Kisstory started as an 8 year old.
Cheerz