One of the misconceptions about the stock market is that is a club for the rich. In fact, it is possible to start investing with just small sums of money. So say someone has £3,000 and wants to use it to start investing in the stock market this August. Set some investing principlesBefore you start investing, it can also be helpful to set some guidelines, based on what you are trying to achieve. Start buying sharesAt some point, research done, it will be time actually to start investing.