Well, I have been out of the wedding business for a number of years, but when I did that, I shot between 300 and 400 weddings...so here goes:
I don't think there is an 'industry standard' for branding of on-camera lighting - but to be effective you should consider the following: even lighting over slightly larger area than the lens field of view, powerful enough to give a quide number of 160 with 160 speed film at full power for large groups in big churches and halls, then you get a guide number of 110 at half power for most of the work (conserves battery charge) and at half power should have a re-cycle time of under 3 seconds. Brackets are somewhat of a challenge - the best place for the light for candid weddings is in line directly above the camera lens approx 12 to 18 inches above. This throws the shadows down behind the subjects more or less out of sight. You can add roundness to the lighting by using a sidelight assistant (adds to your cost, though) triggerred by a radio slave.
Wedding photography is a specialized business and there are some things to learn besides photography - contracts, liability, etc. You will need to find a supplier for wedding albums at wholesale prices (usually 50% of retail to the wedding client). You will also need to consider this - contracts can say you are not responsible for unforeseen equipment failures, etc, but courts have held that this does not exempt the photographer from negligence. If you do not carry a spare camera, spare light, extra batteries, synch cords, etc, you will be judged as negligent if there is an equipment failure on the job.
Pretty much every major city has some studios that are 'wedding mills' - that is they hire 'weekend' photographers to handle some weddings during the busy season. A run through yellow pages can help idendity these - the best opportunity to get a look at the process. You can offer to work as a sidelight assistant on a couple of weddings to get your feet wet.
Hope this helps. Good luck.
Bob