Okay I’ll work up a list for you. If Cassandra Cain is about as far back as you go, then you have a lot of good Batman to catch up with. The Animated Series was good at homages to a lot of batbooks from the past. Timm, Dini and crew know their Batman. So you should make a lot of fun connections. I am still mired down in rewatching Tomino series from 40 years ago. Speaking of redraws and Barbara, Over the Edge is amazing. And I generally hate those type of plot gimmicks. I think a lot of people feel that way about the Animated Series.