5. This won't make sense to anyone except IPS people, but IPS considers Clubs to be part of the Core application, which is available for everyone. Core also includes Status Updates, Messenger, Community Hive, and other foundational features.
1. You're getting all of the applications, except for Courses.
You also won't have access to cloud-specific features like Live Topics, Community Experts, etc. But the basic applications themselves, such as forums and galleries and blogs, will be fine.
For people who are new to the IPS ecosystem, the app that I would point you to is the Pages app, which is the most complex but also the most powerful.