Excellent free resource from TacMed Australia:
One of the most important skills for a medic is the primary assessment. This video will teach you the key ideas - includes stabs/ gunshot wounding etc.
The primary assessment allows us to methodically find and treat life-threatening injuries in the order of severity.
Whether you are a first aider or a critical care doctor, the primary assessment is vital in the timely treatment of casualties.
To help with reference, I've attached screen shots of key points below the video.