200$ is ok to start for the beginners, but you are too late for bitcoins with that amount of money. You should trade altcoins, that price is 0,0...-max 2$. I suggest you to try IOTA but it’s to high now.
There are also one blockchain platform to turn time into the cryptocurrency is one of the projects which Im expecting so bad. https://mytc.io/
Min to start is 30