Hopefully other folks have a few more thoughts to chip in with, but a couple of starters that you might've already come across as far as the ridings and candidates themselves, granted often the candidate is generally a local face for the wider party's platform and plans:
A riding profile done by CBC:
https://www.cbc.ca/news/canada/manitoba/manitoba-votes-2023-brandon-west-riding-profile-1.6953217
A story on a recent Brandon candidates debate that goes into both West and East candidates:
https://www.cbc.ca/news/canada/manitoba/brandon-east-west-debate-mla-1.6972260
For party platforms themselves, in alphabetical order I've linked to their official sites.... granted its often a good idea to also look into media's objective look at various partys' plans, promises, etc:
Green:
https://greenparty.mb.ca/platform/
NDP:
https://www.mbndp.ca/our_plan
PC:
https://pcmanitoba.com/platform2023/
(Liberals arent running a candidate in West)