If you live in a built up area it might be a good idea if you checked with your local council, if in rural areas it shouldn't pose too much of a problem unless you decide to get a cockerel, again if in rural areas make sure the chicken run is completely secure, one of those coups with run attached is probably a good option, make sure that you shut the coup at night, foxes soon learn where chickens are and believe me if you don't shut them up it's a mistake you only make once, chickens need perches to roost at night and nest boxes to lay their eggs in, we always feed a warm mash in the morning (especially in Winter) comprising of layers mash and cooked potato peelings, and any other cooked veg, chickens will eat most things, meat included, not salty or too spicy though (not last nights leftover curry!!), in the evening about an hour before roosting time give them a feed of good chicken corn, a chicken should go to roost with a full crop, also give them ad lib grit, we use oyster shell mostly, they also like greens as well as grass, throw the odd cabbage in or a few leaves of if you only keep a very small number of birds, plenty of soft straw to line nest boxes, clean nesting areas thoroughly once a week but obviously keep an eye on cleanliness all the time and replenish straw as and when.
Have fun if you decide to keep chickens, it's lovely to be able to collect your own eggs.