Hi Madelaine
I'm afraid its a question of list it and hope-the stamp sellers on Ebid seem to be selling well for the most part in most areas, though early pre-1900 stamps are not exactly prominent.
Just so you know, I am a keen collector of Australia, Canada, New Zealand and have just started a new collection of Antarctica. My wife collects by theme, especially Birds, Animals, Olympics and Disney and for some reason Faroe Islands.
PM me if you want any assistance
All the best
John