I think firstly, you'll surely need content for your site. A good/well-written 20-50 articles would be a good starting point. Most often, when you submit your site for their approval, they will lament no unique content, site not enough content, etc, thus, you will surely need to satisfy their content criteria.
Once your site is up and running, try installing a traffic tracking software. If your site do not have traffic - try sourcing for those from a cheap provider, and let the traffic tracking software record those traffic.
Most often, they will also say that your site does not have good traffic, but you can use the traffic data to prove otherwise.