First of all you should have some amount of money in your pocket. Then start buying crypto currencies like monero or ETH.
Bitcoin was also a small crypto currency . If you would have bought bitcoins few years ago like in 2009 or something,
You would have been a millionaire today. Similarly you can try and buy other crypto currencies. Even you can buy bitcoins if the prices fall.
Starting trading with low capital this types of under value altcoins are not at all recommended. They are highly vulnerable to get delisted from the exchanges at any time. We can start trading with bitcoin comfortably with low capital itself but we need to be ready to accept low profits. That is the key here. If you aim for big profits then you might need big capital which is not recommended in the beginning days of trading.