Are you trying to both illustrate and script a book?
Obviously it can be done, but you need to be honest about where your strengths lie.
Comic book publishers are more interested in artists than writers.
One good writer can script ten books for every one a drawer and inker can produce.
An artist who can write has a huge leg up on solo artists and writers.
Identify the publishing address of every major and obscure comic book line and send them samples of your art and/or writing.
Be prepared for rejection and even the theft of your ideas.
Like any other endeavor, perseverence is key.
If you just want to create a single copy of your own personal comic book...
I have absolutely no advice to provide.