I can give you a few thoughts to get you started with action and recording.
On such a form live or test is the first question.
First thing would be a checkbox, denoting live or test.
Also record date and time of reporting, who reported, what the emergency is and a brief description.
You would need to call a meeting of your multidisciplinary team to determine the scale of emergency and confirm who is doing what. Each person should already know their responsibilities documented in procedures. These people would be noted as present a t the meeting on the documents and should report back to the team leader as actions completed.
Record the actions taken and by whom as an when complete.
Record who has been contacted external to the business if necessary.
After the dust settles (hopefully not radioactive) convene another meeting to review success of the event such as completeness, timeliness, safety, quality, hygiene, cost etc. (whatever relevant) and note down any opportunities for improvement.
Sign it off.
Make sure the improvement actions are implemented.
If you want to expand on the above and post it, we can review and elaborate further.
Hope this helps you to get started.
Regards,
Simon