Hi I'm looking for ways to customise my s22 ultra. I've not had an android phone for years so not sure where I should start. I want something that looks amazing
This is gonna be a tough one diving back into customization, but for starters, I'd install Good Lock from the Galaxy Store and go nuts with the available 'modules' it offers. Some will let you change the 'theme' of your phone's UI with color changes and icon sets. If you want to deep even deeper, you can try apps that offer a more dramatic change to the UI (however, these are usually for experts and do often require your phone to be rooted). Changing your launcher is also another usual 'first step' into customization, and adding widgets (some of which can be custom widgets with 3rd party apps).
After you have it customized the way you want, a good place to learn about all the features like the S-pen, camera, etc. is to view some of these videso from Jonathan Casey:
Playlist for S22 videos. I know I have learned a hell of a lot from these videos.... https://www.youtube.com/playlist?list=PLJinhh5tO9NypofaRbz6zTUW63vZBYvGT