If you don't want to take bookings over a certain period, you can set a calendar resources Available From: date to prevent bookings from an earlier time.
Help with these features is strictly chargeable. There are many configurable options, to ensure the most desireable outcome for merchants and end users. To achieve those ends, you will need to configure your general settings, as well as calenders for each resource involved. It's easy to make mistakes, and therefore paid consultancy is required to help you.