I propose to start with $ 100, big money is just not worth it to invest. If there is no experience in the trade, I suggest to try short-term investment strategy is very similar to trade, but more safe in my opinion.
I absolutely agree with you. That's how I started. $100 is something we can afford to lose in most countries and our survival doesn't depend on it mostly. So $100 is a good amount of money to start investing or trading.
It's good for a newbie to start with a low amount that he can afford to lose it. But how much profit will depend on how much your funds that already used to trade in the exchange site. Less amount means low risk because you have decreased your potential to get the more risk. This is an alternative way that everyone can do that,