Actually there is no specific amount of losing money before you earn , it will depends on how you handle the strategy and the flow of the market.

The capital of $100 is enough but not good to buy different kinds of altcoins maybe you can buy some altcoins like two or three but not more than that and the return is not big unless you buy a coin who the price is very cheap and after few months or years of holding it pump very high or many times of it's value.