Looks like you’re interested in building a “community” web page. Which means you’re going to want a theme that integrates well with BuddyPress. This will allow you to easily set up a page where users to start thread, topics, forums, post, and even create pages on their own; and your audience can drive the conversation.
The Kleo theme is the current Coca-Cola of the day, but there are tons out there. Just run a search for Best BuddyPress Themes in your favorite search engine and you’ll get a few lists as a starting point.