I need help to make a documentation that i’m as the consultant and giving my cli

I need help to make a documentation that i’m as the consultant and giving my client (Aneka Buah PTE LTD) document about project : Helping clients to conduct Hotel Property Management Systems.
the document should containing topics :
1 Consultation & Discovery Phase
1,1 Gathering Information
2 Execution & Implementation Phase
2,1 Guidance implementation & execution
2,2 Business Validation
3 Software Requirement System
3,1 Introductions
3,2 Overall Description
3,3 External Interface Requirements
3,4 System Features
3,5 Other Nonfunctional Requirements