I'm taking a fantastic online course through Coursera about writing better resumes and cover letters. I'm a freelance writer and thought it would be a good skill to have. Anyway, Coursera has a series of these courses on how to get a job.
This one might be of use to you. I found the information in my course much more comprehensive than other resources I've seen so far, and you can audit for free! Hope this helps.
https://www.coursera.org/learn/successful-interviewing