Basic Heraldic Resources
There are two main branches of heraldry in the SCA, voice heraldry (court and field, this includes the Silent Heralds) and book heraldry (names and devices).
The College of Herlads is the organ regulating all things heraldic, and the rules and rulings are what defines SCA heraldry. The main page can be found at http://heraldry.sca.org/welcome.html.