Working with animals is a bit vague. It could mean anything from being a vet to educational talks in a childrens farm. Be realistic - there are very few paid jobs being a wildlife presenter on TV.
What do you really want to do?
The
London Zoo site has some information about they types of training they offer. Perhaps you have a local zoo or wildlife park that offers something similar?
Alternatively, if you're interested in smaller animals contact your local animal rescue centre (pets, cats, dogs, horses or RSPCA). They're always looking for helpers. That'll give you the chance to see if you are suited to this type of work.
Good luck.