How is one supposed to behave domestically in a relationship?

I've had a few relationships before, but none where I lived with someone. No matter how often I think about how I might be supposed to act at home with a partner, I can't figure out what I'm meant to do.

So I wake up and... then what? My partner is there. Do I check if they want sex or food? And if they don't want anything from me... what do I do? I don't wanna behave in a way that makes me seem lazy or useless, so I wouldn't wanna do any of my usual hobbies because they aren't productive. Should I just clean or fix something? Find a chore to do until they have an errand for me?

I can't really imagine... relaxing at home in the presence of my partner, I'd probably leave the house to do that without them. Again, unless they needed me to do something. I mean we could have a date or do something together, but... like amd I supposed to be able to do something recreational on my own? Like draw or play videogames without them? I feel like that would become a problem if I wasn't doing something useful or helpful.

If they don't need anything from me, like sex or chores or errands, what can I expect to be acceptable for me to do? Can I just... do my hobbies? Or is that annoying? I don't understand relationships very well.