Have you ever tried demo trading before op, if you Master yourself using demo account to learn trading within six months or higher, it would be better for you to know if you'll start trading with large amounts or not. To me, even after demo practice, I'll still expect you to deposit little amount of real money to begin trading, buy doing that you'll be ought to be more careful than demo.
you need to remember that on all exchanges it takes at least $3-5 to open an order, depending on the trading pair.
I don't think so many, the minimum amount to use trade is from $10 upwards in all exchange if I'm not mistaken. You can only use the amount lower when you want to convert your assets to another within some few minutes on most of the centralized exchange, yeah