The hardest element to understand (stagger) is what is explained in this quick 3 minute video: https://youtu.be/NEdOJ6Jf-Jw
As a general rule of thumb, left is prioritized for formations, this means that when forming a stagger, it is done from left to right, same goes for rank order, and same goes for any odd numbers in an arrowhead.
Shoulder To Shoulder (STS)
Single File Line (SFL)
The spacing in an SFL should be wide enough to the point that people should be able to do an individual face at any perpendicular angle (right or left face), and then they would be in a STS, without touching each others shoulders. As shown in image 2.
Picture below if of a form right on the officer to the far left (in the image this is to the middle). This could also be considered as a form left from the perspective of the MP to the far right (of the line, in the image it is far left)
It is recommended to watch this 3 minute video going over all necessary elements to stagger: https://youtu.be/NEdOJ6Jf-Jw
(Can be even or odd) Image 1 is an even stagger. Staggers is defined as being even, if every other person counting from the left, has an even number and are in the second rank. This means that the person to the FAR left of the formation will always be in front, and all the even numbers (2,4,6,etc) are in the second rank. For odd staggers, this is reversed, meaning that the person to the FAR left of the formation is always moved back. Whereas the person second most to the far left of the formation is always in the front. (Image 2)
Left is prioritized, opposite shoulders need to be aligned with the person in front of you.
A good reference for how to form a wedge is how you would put out bowling pins, increasing by one person in each rank the number of ranks you move back, it can also be noted that the first rank has 1 person, 2nd rank has 2 people, 3rd rank has 3 people, and 4th rank has 4 people, and so on. This pattern will repeat infinitely until there are no more people to form. In the case that a rank can not be completely filled, forming towards the centre of the wedge is prioritized for the back rank. The spacing is a bit tighter compared to arrowhead, a reference is that half of a should and half of a torso should be aligned with people in front of you.
Prioritized sides this means that the number of people will be dispersed as follows, for example if there is only one individual other than the host, they will form to the front, if there are two, it will be front and back, and so on. After there is a person on each side, the distribution loop restarts: