Oh golly, yes, go for it! There is a lot of information online, but a very trustworthy source is the British Hen Welfare Trust. https://www.bhwt.org.uk/hen-adoption/
They obviously slant towards rehoming hens, which I'm not against in any way, but for someone new at keeping chickens, they can be tricky. They're often in poor condition and need TLC to recover from previous living conditions, are in the middle of a moult so can be very bare of feathers, need help understanding how to sleep in a coop and scratch around out of doors. Very rewarding, but can be challenging.
Chickens come in all sorts of breeds, so if you want to explore the option of getting Point of Lay hens (POLs or pullets), you can find lots of different kinds and colours. Some lay blue eggs, white, olive, dark brown, light brown, etc. We have standard browns,
The rule of thumb for space is giving them at least 2m squared per bird, and 1 nesting box between 4 birds max. But if you can let them free range, all the better. We have an 8m x 2m run and a 5m x 1m coop, and only 2 birds at the moment - planning to expand the flock to 6 birds in the spring. We have some more gardening to do before we're happy with expanding the flock, to ensure they have plenty of outdoor space but that it's contained away from the main parts of the garden. We're lucky to have a larger than average garden so they can still free range even when cordoned off from the veg beds and lawn.
The run has hard woodchip floor, and the coop has a straw and sharp builders sand floor. They roost overnight in a very specific spot so I have a litter box underneath to make cleanup really easy. A specific compost bin for their waste so it breaks down properly before being added into the other garden compost.
They get layer's pellets and as many bugs as they can dig up each day. Happy to answer more questions! I love these feathered friends.