In this work is explained how and from which sources are financed companies and risksof each oft he sources and their advantages and disadvantages. The metods and trends of financing in the Republic of Croatian and in European Union are explained too. There are tips for entrepreneurs in the selection of sources to finance their ventures. There is explained important embodiment concerning the financing and running a business, and that is the financial plan, without which it is impossible to initiate and conduct business. With that are defined the ways of making a financial plan. And documents that are necessary to run a business and insight into a situation. For every company is important to adhere to the business plan to work to be successful and had a market share and competitive advantage. It is necessary to know the stages of life of company and how to run business at a certain stage and which of masures need to be taken. Successful presentation is also very important to attract customers and investors as well as the power to negotiate with investors.