Your best option would be to apprentice yourself to a master smith. Swordforum would be the best place to start. Apprenticeships generally run between two and twelve years full time. You can't learn proper swordsmithing in a shorter period (something as complex as traditional tamahagne forging will likely require four at least). Besides, smithing is merely one of many things you need to learn. You don't want to end up with a masterfully forged blade with a slip-shod polish and poor hilt construction (I've seen it, not a pretty sight).
However, if you are looking into this as an artistic hobby and not a career, classes are your best option.
Swordsmithing is an entirely different art from knifesmithing and blacksmithing. A swordsmith is more concerned with chemistry than shape (a wrong length sword is fine (I meant it that way), but a decarburised blade is worthless). Keep this foremost in your mind as you look for classes.
Also, be wary of fake swordsmithing classes. A lot of smithing is taught by the same sort of people who teach McDojos, idiots. Try to get resumes and background about the instructor first. Also beware of anyone that suggests using uses coal or coke (the sulfer makes steel brittle); don't trust anything said by anyone who suggests those as fuels. If they don't know the basics, they have nothing to teach you.
I wish I could suggest anything in particular, but I can't. Just be careful, watch out, and try to have fun. What else are we supposed to be doing here?
Fencing Club at UH