Setting Up Subscription for Site

Good morning, my name is Mychal Wilson and I am a reporter with the Alliance Times-Herald in Nebraska. We are opening a new website for the paper, and I wanted to set it up so that I can sell pdf’s of the paper online as well as other subscription options. The issue I am having trouble with is getting the page containing links to the pdf’s to only show to those who pay. We use aMember Pro for our subscription service. This is who we used before switching sights, and I believe we want to stick with that one.
Any help will help. I know a decent bit about programming, so I was given the task of building this site and making it operational.