Styling the listing with custom fields.
I have successfully created a child theme and some custom fields.
Now I would like to style the listing by adding some text style and formatting. I have done some already by adding <br/> and   to the custom form labels. But I'm sure it would be better to do that using css.
I have looked at the tutorial and I am unsure as to whether I need to create a second or third .css file in the directory: /vantage-child/ or if I should copy one or more of the .php files from the vantage theme into the vantage-child theme and edit them there.
What should I do?
Am I even asking the right questions?