How to host a live on squarespace for members

Hello everyone !

I have questions for which I have not found the answers concern squarespace. I am starting my training on squarespace and a client would like to do a virtual conference and want to make a website to host a live (YouTube or other) with a chat where people can leave messages. However, it is necessary that people who arrive in this site connect to an account first in the website and AFTER have the right to live and chat. Here is some question:

-How do we do to leave certain type of content exclusively for subscribers on the site or to force them to connect to the Live page?
-How do we remove the option '' Order '' and '' Address '' in the profile (since it is an online conference and not an online store)
-Do you know any plug-ins that are ideal for this kind of content (a chat plug-in for example)?

(sorry for the mistakes, I use google translate :p)