BCP content

Disaster declaration procedure: this content focuses on criteria to be evaluated so a disaster situation can be identified and properly communicated.
Emergency notification procedure: this content focuses on the means and activities required to alert people about an emergency situation. This content differs from disaster declaration because it considers faster and local responses (e.g., a building evacuation), while disaster declaration involves incidents of greater scale.
Incident response procedure: this content focuses on how to react initially to an incident in order to reduce the damage
Recovery procedure: this material focuses on activities required to bring back operations back to agreed service levels, regardless if it is on original site or not.

2 - What other procedure are contained in the BCM plan other than the above?

Answer: You can also find as BCP content:

a - the communication plan, covering activities to ens ure information flow for organization's employees, and emergency services, as well as which information should be communicated to the media.
b - specific procedures for critical assets, like servers, information systems and key personnel.

3 - Should the BCM plan be one big book containing the above or should each be written separately?

Answer: Since BCPs cover multiple issues, in operational terms you should keep multiples BCPs, each one of them as small as possible, with only the necessary information for each team that will use them(e.g., systems recovery team, facilities disaster recovery team, emergency teams, etc.). In management terms, you can also keep one or two copies with all the BCPs, so you can use it to keep track of all plans, which will make their review easier.

This article will provide you further explanation about documenting a BCP:
- Business continuity plan: How to structure it according to ISO 22301 https://advisera.com/27001academy/knowledgebase/business-continuity-plan-how-to-structure-it-according-to-iso-22301/
- How to write business continuity plans? https://advisera.com/27001academy/blog/2010/04/08/how-to-write-business-continuity-plans/

These materials will also help you regarding :
- Book Becoming Resilient: The Definitive Guide to ISO 22301 Implementation https://advisera.com/books/becoming-resilient-the-definitive-guide-to-iso-22301-implementation/