Below are my go to references when preparing resumes or preparing for interviews. I borrowed them from my alma mater's website (OXY if you're reading this, please don't sue me. It's to help students, look at it as a recruitment opportunity). I hope they help you as much as they have helped me throughout the years.
Cover Letter Guide
Resume Guidelines
What to wear to an interview
Interview Guidlines
Cover Letter Guide
Resume Guidelines
What to wear to an interview
Interview Guidlines