Choosing a topic

Upon researching on the conventions of documentaries, I came up with these 7 steps that should be followed when making a documentary which I plan to follow when producing my very own documentary.

1. Tell a story you care about
2. Research
3. Make a plan
4. Create a shot list/storyboard
5. Start shooting
6. Start editing
7. Distribute

Many documentaries are created with the intention of changing one's mind and/or bringing light to a certain issue to the masses. Others may very well just be created for entertainment purposes but I want mine to be able to inflict change and to educate people on a certain issue. My only problem as of now is finding that certain issue to be the basis of my documentary. 

My first choice for a documentary that I though about is the current divide that America has on guns. For my subjects I would most probably choose someone who handles guns on the daily basis such as a range officer or an average citizen who carries. My second subject would be an average citizen who has never owned or used a gun. This would help maybe show why there is basically no middle ground when discussing gun violence in America.