One of the main factors of a successful business is a proper information management. The foundation of today's business is the proper information management on the basis of which business decisions are made. This paper presents the decision making process for the implementation of the WMS warehouse management system in the warehouses of Bili Brig d.o.o. from Grude in Bosnia and Herzegovina. The paper explains the importance of the proper information management as well as the connection of the need for information systems that contribute to information management. The data collected from the company relate to the way the company operates and the way it manages warehouses before and after the introduction of the WMS warehouse management system. All the advantages of the system as well as the manner of its usage are analyzed and explained. It is evident that the implementation of the system is becoming an inevitable step in the warehouse management. Without the implemented system, due to lower speed, efficiency and accuracy, the company would grow slower and compete much harder with its rivals who introduced this or similar systems. By describing the implementation process of the WMS information system for warehouse management in the company Bili Brig d.o.o. 10 steps have been defined that can be recommended to other entrepreneurs considering this possibility. For further researches, it would be both interesting and useful to compare the efficiency of different IT solutions offered on the market as well as their cost-effectiveness.