The National office SCCA has made the SCCA Solo rule book available online.
Regional Rule Supplements
The NWR has a set of supplement rule that are in addition to the SCCA rules. The following link is for this years
Also, the NWR used indexes in most of the regional classes. Get up to date with this system below.
The NWR also has a ProSolo Series. Two three events with the last one being the Packwood ProSolo put on by the national office. Be sure to review the rules below