How do I make Victorian looking minifigures?
A number of the minifigs from the Adventures theme would fit the bill in terms of round glasses and facial hair, especially the Dr Kilroy character:



They also have versions with suits, etc.

There's also a "Detective" figure in the Minifigures Series 5 with the classic Deer Stalker hat that resembles the fictional detective Sherlock Holmes.



There are also top hats available in Series 1 with the Magician and Ringmaster.