Please, go face to face into a library and ask them where the writers reference section is on how professional authors are published.
If your library does not have books, cry yourself to sleep. Wake up and in the morning move to a town where there is a library with books and people who love to read them --
I can't advise further
will be what the librarian says to look at first.
Everyone else on WB has a clownish answer
Clowns in America --
Take it from me, library has the answer on how to avoid self publishing.
Avoid agents, they will take a percent and you could do it on your own, finding the publishers & printers -- Get it printed. E-books are easy to erase, print lasts --