If you really want to join in cryptocurrency world just start with as much as you can lose without regrets, because investment is always very risky.
Starting in a small amount is a good start as a beginner, it is about trying out things since you don't have any idea on what you are doing, so spending a little on start is just a precaution, either you make profits or not, what's important is that you learned about your mistake. Then, after that you could start investing more and more until you knew what you are entirely doing.