Rules based calendar

Hi 

I have a spiritual Centre where we have 4 full time employees who are pastors and 5 part time pastors. The following are the rules which are made available

1. the spiritual Centre is open for services only during fixed hours in a day.

2. The full time pastors have one day weekly off

3. during the week they are assigned specific tasks during the week. 

4. People from community should be able to go online and make appointments based on the availability of these pastors and availability of facility.

how do I enforce this using office 365?