This is for a very basic cover, created using GIMP (free software). But if you've been paying $$$ to someone for paperback covers, here's an alternative:
https://bradvanceerotica.files.wordpress.com/2015/10/cs-cover-training.mp4
This will give you background, cover shot, and spine/cover/back cover text. I'm able to do my CS covers for $0 using GIMP.
Happy writing.