Where and how do I set up my payment details. Am I able to pay for holidays my groceries etc?
The answer is no. You cannto currently do any of those things. If you look at the rabbit hole, you will see a connections section - those are the services that are able to be intergrated into your day to day.
Depending on your country though, some services might not be available.
Yes pretty much for now it has Spotify or Apple integration for music listening. Suno for creating tracks, Midjourney for image generation. Now for USA u can use also uber and dash app for rides and ordering food.