I'd say 'Batman: Year One', 'Batman: The Long Halloween' and 'Batman: Dark Victory' should give a decent origin start. 'Year One' features the origins of Batman, 'Long Halloween' the rise of his rogues gallery, and 'Dark Victory' (sequel to Long Halloween) the origin of Robin.
I also liked 'Batman: Gothic' (very stand alone, but by Grant Morrison and with a very interesting plot line). If need be just do a quick Wikipedia search to verify details. I know I found a string of issues some years back with Black Mask that I loved because it felt like I was reading Batman up against a formidable new Big Bad (ha, I was new but I found it a brilliant introduction to Black Mask) that included some issues of 'Batman: Under the Hood', and 'Heart of Hush' is also good (I love Dustin Nguyen's art style). You could probably safely read any of these in any order.