if a beginner I think you better understand about this, once you understand a little, you can do small amount first, for beginner no matter if you start with small amount, start with trade you will get good result. If you invest in large quantities, it is great to get more results .
There is no guarantees that you will always get good result in the beginning with small amount. The point of using small amount is to minimize the risk of losing big while we are learning/practicing to trade for the first time. It is not recommended to start with big amount as beginner, no matter you can afford it or not but it is always better to start with lower risk.