You can start by researching online. Look for publishers that specialize in the type of comic you create. Also, attend comic conventions where you might meet publishers or get leads.
You can start by researching publishers that focus on your genre. Look at their submission guidelines and see if your work aligns with their interests.
One way is to research publishers that focus on your genre and submit your manuscript to them. You can also attend literary conferences and network with industry professionals.
You could try reaching out to smaller indie publishers first. They might be more open to new authors. Prepare a portfolio of your best comic pages, a detailed synopsis, and a bio about yourself and your creative process. And don't forget to follow the submission guidelines of each publisher precisely.
You could look at bestseller lists in the non-fiction category and see which publishers are behind those successful books. Then reach out to them. Another option is to join writing groups or associations related to non-fiction and get advice from fellow writers on finding publishers.
Contact literary agents who focus on non-fiction. They have connections and can guide you to the right publishers. Another option is to look at the acknowledgments section of non-fiction science books you like to see if the authors mention their publishers.
You can start by making a list of publishers that have a history of publishing horror novels. Look at the bookshelves in your local bookstore. Note down the publishers of the horror books you see. Then, visit their websites to see if they are accepting submissions. Some independent publishers might be more open to new horror authors. Also, ask other horror writers in writing groups or on social media for recommendations on publishers they've had good experiences with.