The key to starting a gothic short story is to create a sense of dread right from the start. You can do this by using vivid descriptions of a sinister location or introducing a supernatural element. For example, a howling wind in an abandoned mansion or a ghostly figure lurking in the shadows. Also, start with a character who is alone and vulnerable, making the reader worry about what might happen to them.
To start a gothic short story, you could begin with a creepy atmosphere. Describe the darkness, the silence, and the feeling of unease. Also, have an element of mystery or a forbidden secret that the story will uncover. Another way is to start with a character experiencing a strange event or vision that sets the tone for the rest of the story.