You will need to plan for the hosted services you will be provisioning to customers within the minimal service provisioning configuration framework, along with the servers and other components that support this configuration. You should complete your planning process prior to performing the Microsoft Provisioning System (MPS) deployment.
See Hosted Services Planning Review for pointers to applicable planning information on hosted services you might offer.
See Server Roles for Minimal Service Provisioning Configuration for the server components you will need.