Mr. Scondon,
You'll probably get a reply from someone here about what class to run, or go to the AHRMA site for class rules. Maybe check while your on their site for a classified section, you might get lucky and find someone selling leathers. The best other advice is to attend a vintage event, most of these guys love the attention and are more than willing to answer questions, don't forget these guys all go to work on Monday too! (not like a MotoGP race!!) That's the best place to find stuff and info to get started. I can tell you here the VRRA allow some bending of the rules as long as it's reasonable.