Is there a Minimum to how many shares of stock you must buy into the Stock Market?

Some brokerage firms may charge a fee very strange, but all the discount brokers that I have seen will not be charged for the purchase of peaks (not in multiples of 100). You can not buy fractional shares, so the minimum is 1 share.

However, 

You should really consider what we are doing here. We will not be able to significantly diversity of its investment. You are betting everything in one file. This is more like a game as an investment... Buy an ETF instead. This will provide some diversification to ensure that you are investing rather than gambling.