Just start with a little amount of money over $400, that would be more than enough to start making some extra bucks in a daily basis (aprox 1% or so if you are a good trader)
With the $ 400 we can invest in ripple, this is a safe and potential coin, they can grow a bit in the future, but I guarantee you will never lose money if you buy this coin. They are not highly profitable, but they are quite safe, and you can learn how to trade and experience in the market through investing in them.