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.
Depends on your target because not all would really be having the same mindset when it comes to profit taking and not all would really be preferring on dealing with market on active manner which means
they would most likely to end up on holding rather than on making trades but those expectations or anticipations on making hundreds of thousands out of $100 investment
wont really happen.
Day trades that does have only $100 capital might do but dont expect that the amount you would able to scalp out on day to day basis wont really be that significant
not to mind or in talk about trading fees alone then it wont really be that much of worth of the time but for making
out some practice then this might do.