The topic that I will cover in this final paper is the Marketing plan for the development of the company Promissio d.o.o. What one wants to explore can contribute to business development. Promissio Limited Liability Company for Trade and Services (Abbreviated: Promissio Ltd.) was established by the Company Agreement on the Establishment of a Limited Liability Company on 20.11.2007. years. Promissio d.o.o. actively begins operations in 2009. The address of the headquarters is in Visnjevac, Ante Starcevica 36a, Exhibition and sales salon is located in Osijek, Josip Leovic aisle 11. Promissio Limited Liability Company for trade and services was founded with the idea to offer customers (natural and legal persons) a complete measurement service , sales and installation of room door products (goods). Before the founding and after the founding, a market research was done, and it was concluded that the offer of such a service is very small in the area of Osijek-Baranja County and beyond. Such an idea and the offer of a complete service gives customers the opportunity to choose and have a complete service for a product that they could only possibly buy before. Each customer is individual and the sales and service is done according to the customer's requirements. The vision of the entrepreneurial venture was to offer something new in the market, to be innovative, to integrate a complete service from measuring, selling and installing products to each customer with an individual approach. The first part of the final paper deals with the theoretical part of marketing planning, while the second part deals with the example of Promissio d.o.o. Business marketing plan processed.