Thinking about it there are 3 ways they could go with this as a film series:
Bleach 1: Gran Fisher arc adapting volumes 1-3
Bleach 2: Quincy Arc which ends with Rukia being taken and Ichigo getting his new Blade
Bleach 3: Soul Society Arc
Bleach 4: Arrancar arc until Grimjow's defeat
Bleach 5: End of Aizen War
Bleach 6: Fullbring Arc
Bleach 7: A Thousand years war
But this would obviously be a lot of movies, and i doubt they would be able to keep going on for so long, so my other proposal would be a trilogy mixing elements from Quincy war with Aizen's and completelly deleting the Quincies:
Bleach 1: Volumes 1-3 again
Bleach 2: Soul Society Arc
Bleach 3: War with Aizen where the Espada first invade the SS, Basically the Thousand Years Blood War Arc but with Aizen and the Espada instead of Juha Bach and the Quincy
If WB was willing to do a little more than a trilogy but it still didn't seem like the franchise could reach 7 movies then this would be another possibility:
Bleach 1: Volumes 1-3, duh
Bleach 2: Uryuu arc up till Rukia get kinapped
Bleach 3: Soul Society
Bleach 4 + 5: They could explore the possibility of Aizen and Juha Bach becoming allies like Juha tried in the manga, this could give the movies an original but epic aproach, while keeping faithful to the source material since it would Basically be a What if and fans would have something to discuss since it wouldn't have the same end as the manga.
These are just possibilities, the first film should allways be a stand-alone that adapts
Volumes 1-3, if it's successful then they can move on with the sequels, if it's not then no worries, in least it doesn't end with a cliffhanger.
In my opinion the last option is the most exciting, a different yet familiar direction where we have 2 very powerful villains who may as well turn against each other, Espada + Vandenreich would certainly obliterate should society, and there would have to be a lot of sacrífices.