Library
The next option on the "Getting Started" page is "Content Types". On this page you are able to search through the library and install content type packages that are more specific to your business.
If there aren't any packages you would want to install, you can skip this step.
If there are, you would add click on the package you would want and select the checkbox which says "Select All". Once this has been checked, you can click import in the top right.
Once this has page has been refreshed, the package should be installed.