You can redirect your new users to an onbording bot of your choice

Enabling public registration allows anyone to register on and use your server. This is great if you want your community to be able to register and use your server. However, you may wish to disable this if you would prefer control of the users registering on your server.

Enabling guest users will allow individuals read-only access to rooms on your server without requiring that they register for an account first.

Public registration is off, please set the domains or email addresses from which users are authorised to register. If you don't want to limit registration, please enable public registration. Please enter list of domains and email addresses that registration should be allowed from, separated with spaces (and optionally commas).