It really depends on you. I think it is not fair to say that you need a big amount of money. I think 100$ is enough. Investing is gambling by the way. People say that all the time. I like that citation. You must be aware of what you are doing. If you invest, you must know that you can lose your money or make a profit. If you invest 50k, you can lose or win. If you invest 100$ you can lose or win as well. The difference is just the benefit. If you invest big money, you make big benefits. My advice is to start with a small amount. Time will teach you. Moreover, educate yourself by reading investment newspapers.