Paying extra for cloud space after being notified that I have automatically been upgraded to iCloud +.

Yes. iCloud+ is the same thing, just renamed with a couple of minor extra facilities.

Here's some reading material for you:

Upgrade to iCloud+ - Apple Support

About iCloud Private Relay - Apple Support

What is Hide My Email? - Apple Support

Use Custom Email Domain with iCloud Mail - Apple Support

and Set up security cameras in Home on iPhone - Apple Support which says:

If you subscribe to iCloud+, you can view the last 10 days of activity from one to an unlimited number of HomeKit Secure Video cameras. The 50 GB iCloud+ plan supports a single camera, the 200 GB iCloud+ plan supports up to five cameras, and the 2 TB iCloud+ plan supports an unlimited number of cameras.

Note: Video content doesn’t count against your iCloud storage limit.

How do I actually “enable” and “use” those extra facilities? I got the same email letting me know I had been upgraded to iCloud+, but when I click on the links, it takes me to Apple Support to “Learn more” about the features, but no information on how to actually enable and use the features.