It's still a western and everyone will recognize that. Don't make it look like a book or book galley you've seen. That's a job for the type setter after the novel is sold. Don't submit five page novels. If your manuscript is about seven-foot tall nymphomaniac amazons with silver or purple hair, you have a problem.
Common sense goes a long way toward getting published.
Be polite, persistent, and above all patient. Don't take no for an answer, just be nice about it. Remember, it takes time. Follow up on the progress of your submission but don't bug people. Get the next project going while waiting to get sold.