Add SaaS capabilities

Hi there, please read carefully, I already have a php script for restaurant booking system with the most necessary features but I need to create an SaaS capabilities for this php restaurant booking system script. Please provide me the ideas, suggestions for a very user friendly SaaS.

Questions, Ideas, Suggestions and Comments are welcome, we need all this done in no more than 7 business days. Yes, more jobs available if this task complete satisfactory.

Thanks!