When publishing for a specific journal, scientists first consult the editorial pages of the intended journal for required style information. For physicists, two dominant styles are generally used: AIP and APS. Notice that the style name coincides with the name of the Physics Societies who publish physics journals!
For this class, your professor recommends APS Style.
The complete style guide is availble online as a .pdf document at this URL:
In this guide you will want to look specifically at:
As you write your paper you can also use this guide to learn how to construct your tables, figures, and mathematical equations and much more.