Hi Holly -
If this is literally the first time with the game, and you want to play in franchise:
I think the best starter location is probably the 'temperate biome', basically North American or Europe with four seasons. Not too hot or too cold, but desert and tropical animals will get cold in the winter and cold environment animals like penguins will get too hot in the summer - but these animals will probably be too hard to find on your first go with the franchise. Tropical might be the next easiest if you're going to focus on warm weather animals.
Some of the most flexible, affordable and easy to care for animals that are good for first time franchise zoos are timber wolves or dingoes, or african painted dogs, greater flamingos. Indian peafowl (ie: peacocks) are super easy to care for and cheap and they breed rapidly (great of you want to get a few conservation coins per bird), ostriches are easy to care for in big enclosures in warm environments.
If you're concerned about making quick cash money (the less valuable currency in the game), I might suggest an exhibit (one of the boxes) with an insect in it. They require no care beyond setting their environment requirements at the start, breed rapidly and can be sold for cash. Not a lot, necessarily but can help if you're running low on cash.
I also strongly suggest you go through the tutorial if you've never played the game before - it walks you through some of the key basics. In addition, if you've never played any of the 'Planet X' style games, I'd suggest finding a youtube video on how to create paths, and one on barriers at the minimum. Those two aspects of the game are what makes it work and understanding it will make things much easier. Paulsley and deladysigner both have good tutorials (in English). Finally, experiment in sandbox - it's a great way to try things out without costing you conservation credits.