See if you can get a copy of the ISPE Commissioning and Qualification Baseline Guide , GAMP 5 and ASTM E2500 standard. These all will help you.
The Commissioning Plan should define the facilities, systems and equipment based on system boundries.Commissioning can be used to support validation and qualification. The Validation Master Plan is the High Level document to show the overall qualification approach. It includes the strategy for commissioning and qualification, system impact assessment, outline the documentation requirements, and outline the relationship and interdependency of commissioning and qualification. Then the commissioning plan details specifics for the commissioning.
And get involved early in the project. The Plans should be written early enough to take advantage of Factory Acceptance Tests (FAT) and well before the facility is constructed.