"Principal" as a word encompasses the entire range of functions, processes, and activities related to school administration, education, employee management, and the development of the school. It also covers the overall areas of students' personalities, enabling the school to produce a quality product.
As you have not mentioned your prior experience, the total number of employees in the school, the number of students, the atmosphere of the school, the type of support and backup given by top management, and the expectations of top management from you in terms of increasing the number of students, timeframe, and power to work on quality education.
If you have been in the same post earlier, then it is good for you. But if this is a new role for you, try to contact and connect with others in similar positions known to you by any means. Start setting your target for the proper development of the school by analyzing the present system and atmosphere.
Try to connect with experienced staff members, collect important information, get feedback from faculties, teachers, and related staff, and review parents' feedback given for the school, etc.
These actions will slowly but strongly link you to the system. As a principal, you have a big responsibility for quality education, team-building, coordination with staff, the faith of parents, and so on.
Soon you will manage things effectively.
Best Wishes,
Manish Srivastava