WordPress to add pages….

I’m creating a wordpress site with Headway themes.

I want to create a blog but would like to replicate a feature from mashable.com –

When I add posts they will appear on the front page. But will be limited to 15 posts. Once I pass 15 posts the older posts will move to page 2. Then to page 3 and so on. How do i set wordpress to add new pages for blog posts as and when needed? Whilst adding a featuring at the base of the front page (see mashable) to scroll through the pages?