For the plot of my book, we need to really develop the Police/Inspectors of this world. My main character is going to be a new inspector so creating how the system is structured and how one becomes a new inspector will greatly affect the development of the story.
Basically, the police force has only been around for 30 years, they are young organization. And they are still trying to build up their influence across the country. Inspectors must pass a rigorous test after working as a generic officer for 5 or 6 years. Once they pass the test, they are assigned to a jurisdiction under the supervision of an experienced inspector.
To become a generic officer, you have to have finished primary school and go through a rigorous training program and establish yourself as a hard working and trustworthy individual.