We used our own rules - they are on the website or you can e-mail me for a set.
The figures (and that's not all of the collection) -
Minifigs (going back to the original 1960s Lord of the Rings ones)
Games Workshop
Lamming
Ral Partha
Citadel
Asgard
RAFM
Hinchliffe
Grenadier
Garrison
Crocodile
Reaper
Britains Elephants
Toy shop and metal Dinos
Plastic dragons
conversions
a few scratchbuilds
And many many others built up over 40 years of collecting.