There are online instructions for creating blue swords, glaives, red swords, and nigh everything else. There don't seem to be any for the very basics of fighting, though, except for SCA and "lightest-touch combat" styles.
At SUNY Albany, a guy holds irregular meetings teaching SCA boffing. That's great and all, but I'm pretty sure it doesn't work well for Belegarth purposes -- the three basic shots target the head pretty aggressively. We wear hockey masks.
In conclusion to my long-winded and round-about manner of asking a question, is just taking to the field with a couple of blue swords and shields the best way to learn Belegarth combat? Or are there particular things that need to be paid attention to?