Hi mysterynovice,
Now there's a question I could write a book about.
There are many factors that determine how hard it is for an author to get published. 99% have to do with you, and how you present yourself to the publishing world. Only 1% have to do with what you've written. Okay, maybe that's an exaggeration, but I'm trying to make a point.
Be professional in every way. Learn how to present yourself and your work, and know what it is that agents and publishers want to see from you. One of my favorite movie lines was delivered by Robert Redford in the movie, The Spy Game. "When did Noah build the ark, Gladys? Before the rain...before the rain."
Do your homework before you submit, not after you've collected 50 rejection letters.
Dale