Hello, I'm new here and I'm currently in the same boat (considering 8 vs 11), but regarding this -
Once I am done with that should I be going for OCA 11 (1Z0-815) and then OCP 11
I don't think the SE 11 certification offers a "Associate" level. I think Oracle has scrapped the associate certification completely, and you need to complete both the 815 and 816 exams to claim the certification.
Correct me if I'm wrong!