Duplicate sample-environment.ph and sample-app.com outside of the samples/ folder so that they're parallel to core/
Example:
root/
core/
sample-environment.php
sample-app.com
Then, rename sample-environment.php to environment.php and sample-app.com to whatever your app name is (ex, foobar.com).
Results:
root/
core/
environment.php
foobar.com
Finally, point your host/localhost to your app folder to begin.