Writing a paper can be an intimidating process, especially the first few times you are faced with it. However, there are a tremendous number of resources for you to refer to, not the least of which is your graduate advisor.
Below and to the left are resources to help you with writing your manuscript, submitting it to a journal, revising it according to reviewers suggestions, and what to do if you need to resubmit it to another journal (APS does not endorse or assume responsibility for the information posted on these web sites).
Resources from APS Archive