when should i read Carmilla and what are some more classic vampire novels you suggest?

I recently bought Sheridan Le Fanu’s collection of stories “In a glass darkly”: it contains all the tales of Dr Hesselius, the last of which is “Carmilla”. “Carmilla” is the story i’m most interested in so i wanted to start with that, but i am not sure if the stories are connected, and therefore should [...]