My dad used to keep them when I was growing up, they were surprisingly fun as a kids pet.
Best advice is make sure you keep them in a secure run with plenty of space to scratch and er, run around in. As others have said though, please please PLEASE lock them away SECURELY at night or the very second it starts to get dark. Literally everyone else I know who's kept hens has had some or all eaten/attacked. Duh, how hard is it just to lock them away properly at night? Although obviously foxes are very wiley and will dig under/climb over things etc. If you can't build a proper, covered run yourself then spend everything you need to to get one cos hens are easy pickings. Don't keep males if you live in a non-rural area because your neighbours will do their nut when they're woken up every morning at 5am.
Negative stuff aside, enjoy the fresh eggs every day!
Oh and remember to wrap sellotape around them before you shag them, it ain't pretty when they burst.
My Girlfriend and i have chickens(4) and they live at the bottom of the garden in the girls old wooden wendy house, but do section a bit of garden of for them as they do destroy it, they love to scratch, and they love scraps, they favourite is curry left over's chicken korma or masala..i'm not kidding but make sure you collect the eggs regularly as they do tend to eat them and its a hard habit to break, also they like to perch at night a couple of feet from the floor don't forget a separate nesting box, and don't over complicate it...but most of all enjoy them, and remember when they come from a battery farm they have never seen the outside world..daylight..rain...noise..grass..anything so they won't do anything for a while, but they are funny and fun and they let you know when they lay an egg..
Battery Hen Welfare Trust <Battery_Hen_Welfare_Trust@mail.vresp.com
I got my 4 hens from these people. They resuce battery hens that are about to be put down. They are a bit scraggly when you get them but they soon grow their feathers and start scratching around the garden
The best advice i can give is if you build a pen bury the wire a foot under the soil so that if anything tries to dig under the wire it wont be able to.
I had a pen of chooks, then I brought my racing greyhound home for retirement and a week alter i had no chooks left lol
he didnt rip them up, jsut got into the pen and couldnt get out and the chooks all had heart attacks.