Links
Sites for autograph collection information:
This site is the best for updated fanmail adresses, success or fails, how to write and where to, what not and what to do. You can get a trial period or pay some $35 a year for a full membership.
https://www.taminoautographs.com
A very good beginner's guide to autograph collecting. Many pages to go through but a lot of info that will get anyone get started.
Sites by autograph clubs and special interests:
German facebookpage about collecting autographs. Autogrammkarten are a big thing in Germany and every German celeb has their own cards to hand out. This is a perfect page to see what can be collected.
Sites by friends and fellow collectors:
My good friend Gustav has a vast collection. Follow him on facebook to see his successes. He's always willing to help anyone if asked nicely ;)