Their website has a huge amount of useful information.
Membership is very reasonably priced and includes a useful newsletter with lists of new finds and background info on perfin users.
However, one challenge is the sheer number of different British perfins!
The latest figures I have to hand are 24,932 different dies (different patterns of holes) used on 268,704 different combinations of die and face different stamp.
I've tried two methods to display them:
(1) One face down stamp for each die that I have with additional face different stamps shown face up, set out on black Hagner or Prinz sheets.
(2) Face down face-different stamps set out for each die on clear Vario sheets.
In principle, I prefer method (2) but in practice I'm happier with method (1) as the stamps are more likely to stay lined up as I set them out.
Edit: I'll add some scans when I get my new laptop to talk to my scanner!
Maybe this site would be of assistance, especially if you view the exhibits. http://www.angelfire.com/pr/perfinsoc/
EDIT. Heck Nigel beat me to it, I'll have to get up earlier.
To display them, a suggestion would be to find a normal example of the each stamp. The stamps with the perfins are better see from the back. Start a page/line of a stock book/sheets with black pages with the normal stamp, then follow that with the perfins face down.
If you decide to go forward, place a want ad of what you're looking for. I'll bet you'll get a bunch right off the bat.