Do book publishers have editors?
Your finished manuscript needs to be as near 100% perfect as you can possibly make it! Go through it with a fine tooth-comb, checking for errors of all kinds. Let’s use your question as an example of the sort of thing you should look for. To begin with, all novels are fiction, so you don’t need both words. Grammatical has 2 ‘m’s; and if you’re in the UK, the word ‘dialog’ finishes with ‘ue’. Learn to be your own best critic! All publishing houses have editors, and if your book is accepted for publication an editor will be appointed to work with you. However, a beautifully typed and professionally presented manuscript will give that all-important good first impression. Good luck with your book – keep writing!