Just to throw some ideas out... I work as a catsitter and dogwalker in the UK, which is something you could possibly do straight away. You don't really need any qualifications, however you do need to be insured and to have some kind of reference of your trustworthyness. I don't know what the equivalent would be in Canada, but I had to get a police criminal records check, and got a letter from them saying they've no records about me.
Dogwalking can be done 9-5, Monday to Friday (though I get some weekend bookings). You have to be happy to pick up poo and go out in all weathers (a good waterproof jacket is a very good investment!). You can't have a sick day without arranging cover.
Catsitting is 7 days a week and I rarely get days off as bookings overlap. In rural areas catsitting might involve actually staying in the client's house, but I visit 1 or 2 times a day and can be visiting several cats at once. Cats may not be friendly: I've had blood drawn on a few occasions. On the other hand many of the cats I work with I visit time and time again and have built real relationships with. Holidays are busiest for catsitting (when other people are going away, you are flat out...). At Christmas I can be out for 14 hours, walk about 14 miles per day and still have paperwork to do when I get in. I tend not to get to watch the Christmas telly.
I've also looked after small pets: a good line if you have space at home. I'm not able to at the moment (5 cats at home...) but I do visit someone's hamster in their home.
I work through an agency, which means I have someone who handles bookings, getting money off clients etc, and also means they can usually arrange cover if I need time off. If you do think the job might be for you, think about joining an existing operation rather than starting your own.
For the future I'm hoping to do a second degree in Animal Welfare and Behavior. This will qualify me to work as a pet behaviorist, which is what I'm working towards. However the course I'm looking at also includes a lot of practical work with exotics, and I believe many off the course go on to be zoo keepers (I'm going to be a little on the old side for that once I finish!). If you want to do a course, a degree in Animal Welfare/behavior/management might be something to look for: no idea what they have in that line in Canada!
I really know little about working in zoos, but my impression is it would probably be better to get some experience, even experience with none-exotics, and think about working towards joining someone else's zoo rather than starting your own. I really think you need to get your hands dirty and see if you really like it before you are going to get far with it. Just about any job with animals is going to mean getting wet, cleaning poo and unsocial hours. If you are happy with that, good luck!