I am delighted to be able to refer you to the blog of Nicola Morgan who chairs the committee of the Society of Authors in Scotland, on which I sit. Nicola is the most qualified person I know to give advice on the subject of getting published. Rather than list all her qualifications here, though, I suggest you read the blog and follow the link on it to her main website.
If it all seems a bit intimidating to you then consider asking me to help you take your book from your mind to the bookshelves. It’s my job!