You have tennis courts for rent. You can offer your customers four open-air courts, and two balloon-covered courts. In this sceanrio there are only two services offered - outside and inside tennis court.
Set Calendar Type to Public - this option will allow to search the calendar by its name later on.
Set Calendar Authorization to Confirm Access - you will authorize every client before he/ she is granted an access to browse the schedule and see available dates for each service you have defined.
Set Order Authorization to Auto - customers with granted access to your calendar will make their reservations which will automaticaly be accepted. However, you would always be able to reject particular reservation.
Set Order Details to Busy/ Free - your Customers will just see the word Busy over unavailable dates. Option Details would display to all members accessing your calendar name of the service and a client under particular unavailable date.