If you want to earn money by streaming on twitch you will first need to gather enough of a following to get partnered. This will allow viewers to subscribe to your channel, to donate to you using bits and it allows you to play ads if you want. You can read more about it here:
https://www.twitch.tv/p/partners/
Once partnered, the biggest income you can get is if you have subscribers. You get 50% revenue per subscription (twitch takes the other half), meaning for each $4.99 sub you get $2.50. This means if you can get to 1000 subs per month, you will earn $2500 per month, which is R35000 using R14 to $1 exchange rate.
Note that this is also before income tax, so you won't be able to pocket the full amount unless you plan on not paying income tax.
You also have to get to 1000 subs to get that kind of income, which will not be easy. Apart from the hundreds of popular streams that each have 100+ viewers, there are thousands of other streams that don't even break the 10 viewer mark. You need something to stand out from the competition and you need to be able to market yourself. This means you either need to be really good at a game that people like to watch (Dota, LoL, CSGO, WoW, etc.), or you have to be entertaining enough that people watch your stream for you, not just your gameplay. Another avenue is to play with a friend that already has a twitch audience and using that as a catapult to start your own stream (if people want to watch you).
This is incredibly hard to achieve and many people fail to do so. Ask any streamer that makes an income and/or devotes their life to streaming and they will 99% tell you that for you it's not possible to do. It's nothing against you personally, it just requires too much effort and luck. It's too risky, and you're far better off just doing it as a hobby while you earn income from a different more reliable source.
That said, nothing is stopping you from streaming in your free time, which can maybe lead to you generating some income from it (if you're incredibly lucky). But don't let it consume your life.
Good video on income from twitch: