What is a little money you're taking about? It depends.
For my $1,000 is a little money or someone's $1 is a little also.
Well, no matter how little your money but if you're willing to invest you'll get earnings, not as huge as trading with big capital but you'll get an increase out from your assets.
You can start trading with any amount as long as you want to because in Cryptocurrency there's no good amount to start off but as long as you have time and willingness, you'll probably get profits.