MSP provides specific processes (Identifying a Programme, Defining it, Managing the Tranches, etc.). Use the Blueprint document. This is your "to-be" state—the design of the future organization, processes, and technology. Do not start projects until the Blueprint is approved.
While principles guide behavior, define what you must continuously manage. There are six key themes updated in the latest MSP 5th edition. Managing Successful Programmes
MSP is the rulebook for that transition. Managing the Tranches