And yes, it can be a hobbie and then some. You stated: modern BP and have to assume you are talking In-Lines.
I would not rule out Traditionals as that is where history and romance lies. Welcome to a great Sport, Hobbie and for some of us, A Way of life. There are just so many places to go for information and first off suggest you get a current copy of a manual by Sam Fadala by Dell or Lyman. You should also Google this subject and here are just a few links of what I have. Take care and be safe !!! .....
http://www.buckskinnerweb.com/links/traders.htm
http://www.possibleshop.com/