Add the tag “featured” to your post or page to have it show on the front page. The front page supports three posts at a time. To arrange them, try changing the published date – most likely they are ordered from new to old.
Use pages for things that will stick around for a while and won’t change much. Use posts for ongoing streams of information, such as updates, events, reminders.
You can feature both posts and pages on the front page. New content starts on the left.