Welcome to GKO!
Currently, all the Batman stories are ongoing. It all depends on which of the Bat titles you plan to read and collect. So, if I was in your shoes looking to get into the Batman comics, I would most probably start reading the following.
Core Titles:
1. Batman #700 onwards
2. Detective Comics # 866 onwards
3. Batman and Robin #10 onwards
4. Batman: The Return of Bruce Wayne #1-6
Supplementary Titles:
1. Batman: Streets of Gotham #13 onwards
2. Batgirl #9 onwards
3. Birds of Prey #1 onwards
There are also Gotham City Sirens, Red Robin and Azrael which I do not follow. My advise to you is to get into the core titles first and if budget permits, you can also read the supplementary titles.
Some of the the issues mentioned above are currently available at your local comic store and some will be released soon. You might also want to read the Batman: RIP and Battle for The Cowl graphic novels before diving into the monthly series. Hope this answers your questions.