So I am guessing clubs will be it's own app that can be purchased for an additional fee?

No, it's part of the core. You have to enable them in your ACP

No. It should come built in with forums app.

At least that's what I understand.

1 minute ago, David.. said:

No. It should come built in with forums app.

No, it's part of the core. Depending on what apps you have, these content  types will be available in clubs