What is your main thesis? (if you wish to discuss)
Perhaps some of the people here could help you tweak the main idea.
Its been about 6 years since I was in college English but I recall most of my argumentative papers breaking down into a thesis supported by 3-4 main points, each with their own sentence.
"Guns are a benefit to society" is kind of vague, although I'm sure that is just an abbreviation for the forum.
Personally I think it is really irrelevant where or not guns are a benefit to society. It would be like discussing if Alcohol or Religion are a benefit to society. The fact is that Guns, Alcohol, Religion etc are all integrated parts of American society and that will never change. It is how we choose to live with them that is up for debate, how much should they be limited.
Although it may not be what you wish to talk about in your paper - I will throw it out there - you may want to consider not focusing on how guns do benefit society (which even to me, a pretty moderate gun supporter sounds kind of dubious and open for debate), but instead discuss how nearly all of the proposed gun reforms will not have stopped any of the massacres over the last several years. This is easy to prove.
All of the various gun laws that haven been passed, even the now dead Federal Assault Weapons Ban, would not have stopped Sandy Hook or the CO theater shooting, or the UC Santa Barbara killer and the list goes on. Gun control activists keep trying to pass reforms that actually won't stop any of these massacres because they refuse to accept that a certain number of gun murders, including mass shootings like University of Texas 1966, are part of the price for having a society that accepts guns and gun usage by law abiding citizens. There will always be these type of cases, they are OUTLIARES and can never be truly avoided. Also you could talk about how banning guns doesn't actually keep them out of the hands of criminals - just look at Mexico.
In summary, I just wanted to say that it seems a lot easier to me to disprove and debunk the gun reform arguments than to argue for why Guns are Great for America.