well,,,,,,,
David Kopel is a great source, he does alot of numbers, alot of history.
the FBI uniform crime reports (whenever you see a news commentator reference crime statistics, it's nearly ALWAYS the FBI uniform crime reports)
are available on the web, and will show a general trend of declining crime.
Some general things I would look to include in such a presentation are
>brief overview of history of arms regulation, such as that concealed carry has been regulated for centuries whereas open carry has generally been lawful
>the racist nature of early gun control laws
>Washington state goes shall issue in 1961, being the first state to do so. and the prelude to the right to carry movement
>Bernie Goetz, in 1984 shoots and injures 4 attackers on a New York City subway with an illegally carried S&W revolver, is acquitted of all charges except for carrying a concealed weapon, this jumpstarts the right to carry movement, showing a general resentment towards criminals in that era
>Florida goes shall issue in 1987, beginning the modern shall issue and right to carry movement. Florida's law (unlike Washington's) requires training for a CHL and is widely emulated.
>1994, assault weapons ban passed at federal level, but not all was bad for gun rights that year, again, a resentment of crime in general leads to numerous new laws, including three strikes, mandatory minimum sentencing, along with new laws allowing concealed carry and shall issue licenses.
several other things useful
>The myth of the collective right
intellectuals and college instructors often espouse the idea that the second amendment only protects a right to own guns connected to service in the military, they base this on Miller v. United States, and in fact Miller never says that.
of the 40 or so states with constitutional right to bear arms in their state constitutions, every single one references an individual right to own arms, Nunn v Georgia in the 1840s before the Georgia Supreme Court determined that the 2nd amendment guaranteed a right to own arms individualy.
>Dred Scott v Sanford, in the infamous decision denying black people citizenship and upholding slavery, Justice Taney writes that blacks cannot be citizens because "people of the negro race would have the right to keep and carry arms wherever they went" this is connected to racist roots in gun control
this should be enough of a primer to give you an idea of what to look for for information and some google searches you can make.
good luck on your project!