Starting a Sisters army, I can't decide between Our Martyred Lady, Bloody Rose, or my OC Order (probably just black armor and white cloth to nun-max the aesthetic)

I do like that Sisters lore lets you goo full /yourgals/ in a canon Order

>>96065679
I've been doing models for years, this is just the first time I'm trying to make a playable army
>>96065694
I don't car about Meta I mean like, how can I build A 500pt army out of the kits in this box that I can start playing with asap?