new to the App and DC comics where should i start in Batman? The Flash?

So i’m new to the DC comic scene. I have watched the cartoons since a kid and loved the DC universe it presented but got disillusioned with the DC cinematic universe. I want to read Batman and the Flash but with over 70 years of comics out there im lost as to where i should begin. I was told to read wally west first and for batman year one and go from there. But if anyone has any other suggestions i would greatly appreciate it.

The Long Halloween is definitely a great option after Year One.