You are interested in investing in Bitcoin which is great. You can buy bitcoins from Kucoin or Binance p2p to buy bitcoins. One thing you need to be aware of is that exchanges are risky so you don't keep bitcoins on exchanges. You buy bitcoins from an exchange and transfer bitcoins to a good wallet. But you will try to hold the investment for a long time. You can earn a lot of profit if you hold for a long time. Many say invest what you can afford to lose. You keep investing in DCA method. Good luck to you.