Yours is a good question, but EXTREMELY broad. Firearms is a very diverse field- rifles, shotguns, handguns- hunting, target shooting, skeet & trap, self defense, etc. The answer will depend to some degree on where you are, and your age. If you are a youngster, there are some educational programs offered through the 4-H clubs, Scouts, and even some YMCAs. The National Rifle Association offers a number of educational programs (nra.org) as will your State Rifle Association. There may also be programs offered through local shooting ranges and clubs- and there are dozens of different firearm forums where you can ask questions, read discussions, etc. You may also post a message on my message board for additional information.
There's a whole shelf of books on firearms in your library. Or you may find information on www.savagearms.com
Blue Book of Gun Values
Library, gun shop, gun shows, the internet
A person could go to DPMS firearm website to get information on firearms. It provides helpful tips in the FAQ section of the website along with contact information to get further assistance.
What information do you want? Firearms have a wide variety of uses.
No way to find out.
In firearms, antiques are LEGALLY defined as made prior to 1899, OR muzzleloading firearms. Newer than 1899, they are old, but not antiques. My best reference is Flayderman's Guide to Antique Firearms. You may also find a dealer or collector that can share some information with you. Check for gun shows in your area.
The kind of information one can find on the website Stoeger Industries is that about firearms. Namely, Stoeger Industries is a manufacturer and importer of firearms into the United States. Besides that, they also publish books and videos about firearms, hunting and fishing.
Any good sized library will have books on firearms and how they work.
Contact the Cody Firearms Museum.
Possible places to look include the internet, the library, company website.
Yes, you can find information for Stevens firearms at the Savage Arms website. http://www.savagearms.com/