ideas for my manga series?

hi i love to draw manga and i am hoping to start my own series soon i plan on it being a horror series. i think i want the setting to be in LA and partially in denver. i want my main character to be a male tattoo artist. i also want to incorporate some paranormal horror in it. perhaps show a flash of the main character’s past being traumatic as a reason for the paranormal horrors he faces. if anyone has any ideas please feel free to post your ideas. thank you!