Best Option... Authentication/Notes/Chat?

Hello Drupal Community, I have a lot to ask for on this one - any advice would be greatly appreciated!

Alright, this is what I'm looking at doing.

I have a live video feed on my church's website, the url is currently: http://www.newcreationwoc.org/live

What we need to do is setup a way to accurately track the stats on who clicks play/uses it on a weekly basis. I'm thinking the best way will be to turn on user signups and use user authentication.

This leads me into my next issue. We want to have a "notebook" feature and a "chat" feature for users who are watching. We want users to be able to take notes, and save their notebooks. Are there any modules that do this, or any 3rd party applications that may easily integrate?

What about chat applications? Are there any that easily integrate into drupal? We're looking to make our viewer experience very much interactive, and any thoughts and assistance with this would be awesome and greatly appreciated.

I understand that there might be some paid services; as a church, we obviously would prefer free services/help/advice, but might be willing to pay as well. Please let me know.

Thank You
Josh Mans
New Creation World Outreach Church