Usually it helps to have a co-author that is established in the field. I didn't do graduate work (and undergrad was in CS) and have one publication in physics

Usually it helps to have a co-author that is established in the field. I didn't do graduate work (and undergrad was in CS) and have one publication in physics and another coming up in biology, but in both cases there is a university professor on there as a co-author. In blind peer review this isn't a strict requirement, but it will help you put things in the right language and help you make sure that you're referencing the right things.