There is no minimum money you can use to trading, and you can use small money, even for $10. My advice is better you have $50-$100 to start trading. Try to get bitcoin first in many exchanges and then you can start to buy bitcoin pair altcoin or bitcoin pair usdt. You need to learn about trading first before you make a real trade in the exchanges, so you don't have to confuse how to buy and sell any coins. Don't believe the news you read but always analyze by yourself. Don't be afraid if you cannot make a profit for the first time you trade because you will get your profit later and it needs the right time to make a profit.