Rules writers pay attention! Mike Willegal has written an analysis of the effectiveness of black powder muskets.
Peter Hunt of the Hong Kong Society of Wargamers has written a set of articles about Naval Warfare in the American Civil War. This is, I think, a sadly neglected period for wargamers. I have a couple of dozen ships in 1/1200 scale, and the games have always been well received.
The British Battles website has accounts, maps and orders of battle for dozens of famous battles involving the British army. Included are Battles from King George’s War, the Jacobite Rebellion, The French and Indian War, the American Revolution, the Peninuslar War, and other Napoleonic Era battles. It’s an incredible resource for the miniature wargamer.
When I first started playing Napoleonics, I was lost. There were so many characters and places and battles and politics and subterfuges. I enjoyed moving the lead around, but it was years before I felt I understood the greater background. If you want to break in a newbie, point him to this site.