I would agree with Robert, contact your nearest BKA, find out if they have any classes on beekeeping and/or their own apiary, latch on to an experienced beekeeper, initially obtain some protective gear and have a look in the hives to see what is there, what to look for and if you actually like bees buzzing around you and stinging you at times.
Buy protective gear new if possible but try and get hives etc second hand and let it be known that you would like a swarm if any are available. This way the bees will cost you nothing. To buy everything new is going to cost somewhere in the region of £200, but I haven't bought new for a long time , other than foundation so my estimate of cost may be very far off the mark.