Unlike dogs cats don't need walks, although some people do take theirs out on leads, but they do need a fair amount of play and attention. You can get lots of toys for them and cat towers, so that helps, as they love to play, even adult cats, but not as much as kittens do. Some cats like to go out for a wander and some cats are happy to stay inside. Scratch posts are essential.
You can get a rescue moggie or a rescue pedigree, a pedigree that's known to be cuddly and affectionate. I'm not up on pedigrees, so I can't help with that.
You should consider allergies. I've had cats for nearly 30 years and I am allergic to their fine fur, so I have to be very careful and not get fur around my face, but it's never put me off as I love sharing my life with them. Also, do you mind having fur on your furniture, around your house and on your clothes. Will you mind having your furniture scratched and sometimes shredded?
Your initial costs will be cat feeding bowls, water bowl, litter tray(s), cat bed - this may or may not be used by them. A cat flap, if they're going to have access to outside. Pet insurance, which ranges from £15'ish a month per cat, but insurance companies won't insure cats over the age if 5. Annual vet checks for injections and boosters. Regular de-fleeing, worming & tick treatment. Mircochipping and passport, if necessary. All of the paraphernalia that comes with cats, as above and cat litter, food, etc.
Will you put them in a cattery when you go away or get someone to visit them a couple of times a day to feed them and check that they're ok?
I think if you've never had a cat before, you don't necessarily realise the work that goes into caring for them. I'm not trying to put you off, but it's not as simple as you think it'll be, but you do get used to it. However, they do bring a lot of happiness into your life even though they're contrary sods
As you can see from the litter tray, we're all potty about our overlords and wouldn't be without them.