Now, at age 65, I own my very first AR-15 rifle. Please suggest a couple of your favorite references for learning about this marvelous gun; books, videos, DVDs, web sites (other than this one, naturally), periodicals, Ohio training facilities, etc.
I expect to spend to spend this next year simply working to become proficient with this factory-stock rifle and its iron sights. It's a Bushmaster M4A2 Carbine with 16" barrel and its role will be recreational shooting and personal defense. Whistles and bells will come later.
Other than this website, you really don't need anywhere else to look for info, seriously.
BUT, here are a couple of links you can go to, and have a look around.
Maryland AR15 Shooter's Site
These are just about the only sites other than this one that I myself use, since I can find out almost any info I need right here.
ETA: I almost forgot...welcome to the site, and enjoy your AR!