Do a forum search at http://www.e-budo.com
for cities in your area. Add to the search the words kendo, iaido, kenjutsu, iaijutsu, and battojutsu. That should turn up whatever training oppurtunities may be available in your area.
Yes there are several extant lines of traditional Japanese Swordsmanship available in the US. They are few and far between and there are a lot of yahoos making it up as they go along, but there are genuine dojos available.
I'd also suggest heading over to google and searching for Richard Stein's Japanese Sword Index. That is an excellent site for learning about Japanese swords. There is an article there that should be easy to find entitled "Is it Real?" or something to that effect. In all likelihood, what you have is known as a gunto. Gunto were mass produced during the war so that all Japanese officers would have one. Kind of a badge of office. Some swords carried into battle were family heirlooms remounted in gunto fittings, but these were very rare. In either case, it has value to collectors as long as you don't try to clean it up in any way. See the articles at Richard Stein's site for more info.