According to the Project Management Professional (PMP) guidelines, once a project manager has been authorized to begin a project, the next step is to assemble the project team. The project manager should select team members based on their skills or potential to contribute to the project's success. This is crucial because having a team with the right skills and potential can significantly enhance the project's chances of success. References: PMBOK Guide, Project Team Development. Please refer to the specific sections in the PMBOK Guide and PMP study materials for more detailed information.