An interesting thread - I've edited your title to remove the 'an' typo by the way.
Starting a hobby seems to have fallen out of fashion in the sense that people no longer indulge in collecting stamps, birds' eggs, butterflies, football cards etc. as they did in times past. A couple of those hobbies are illegal now, of course, and obviously there are still lots of collectors, but not in such huge numbers. you don't seem to hear the word 'hobby' these days; people have 'interests' instead.
I kept chickens (and bees) when I was a teenager, still living at home in the countryside with my parents. The deal was that my father permitted the chickens and bees as long as I did the hard work - his involvement was limited to collecting and eating the eggs and eating the honey. It wasn't a hobby as much as a chore - be warned that chickens, in particular can be hard work and of course you can't go off on holiday and leave them to their own devices; it's a tie.
Nevertheless, it can be very satisfying, and I wish you luck. Nowadays I limit myself to a bit of photography and playing (in a mediocre fashion) blues on guitar- less work involved. I'll be interested to see what interests/hobbies other forum members have.