How do I import a csv file into my new custom post?

So, I have custompress installed. I've created a new custom post that has 4 custom fields. I have a list of 600 posts to add. These custom posts are a directory of group members for an organization.

I'm trying to figure out how to see the formatting required of my csv file.

I see these fields:
"post_name","post_title","post_content",

But I can't find my custom fields in the database. Can you assist please? What is the best way to add these 600 posts?